Summary of Citation

GEOLEX database

Geologic Unit: Lamotte

Publication:
Winslow, Arthur, 1894, Lead and zinc deposits: Missouri Bureau 
   of Geology and Mines Report, v. 6-7, 763 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Named	Ozark uplift	Sandstone

Summary:
Pg. 331, 347-358. Lamotte sandstone. Great body of sandstone in southeastern Missouri. [Occurs in St. Francois, Madison, and Ste. Genevieve Counties. Consists of soft, friable white sandstone, sometimes yellow or brown at surface. Total thickness not known; is at least 250 feet.] Immediately overlying Archean crystallines about Mine La Motte Station, but overlying Cambrian Iron Mountain conglomerate in Iron Mountain district, St. Francois County. Underlies St. Francois or St. Joseph limestone. [Age is early Silurian (Ozark age). Report includes correlation table, geologic map.]
[Type locality not designated.] Named from Mine La Motte Station, Madison Co., in southeastern MO, Ozark uplift.
[Discrepancy: GNC records (US geologic names lexicon, USGS Bull. 896, p. 1140) indicate "Lamotte sandstone" is used in this report and it is "Named for..."; GNU records (USGS DDS-6; Denver GNULEX) indicate "La Motte sandstone" is used in this report and it is "Probably named for?" (explanation for these differences not given). --Bull. 896 is presented here.]
Source: US geologic names lexicon (USGS Bull. 896, p. 1140); supplemental information (in brackets) from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Winslow, Arthur, 1896, The disseminated lead ores of southeastern 
   Missouri: U.S. Geological Survey Bulletin, 132, 31 p.

Usage in Publication:
La Motte sandstone*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Ozark uplift

Summary:
La Motte sandstone. A more complete description of the unit. Report area in southeast Missouri, Ozark uplift. Thick massive sandstone; beds composed of quartz grains. Sometimes matrix is limy. Thinly bedded or flaggy near top; grades into sandy limestone and alternating beds of limestone and sandstone. Near base often coarse-textured. usually soft and friable, often false bedded. Color generally yellow or reddish, sometimes white. Thickness 400 feet. Underlies St. Joseph limestone and overlies Archean rocks or Iron Mountain conglomerate. Age is Early Silurian.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX); US geologic names lexicon (USGS Bull. 896, p. 1140).

Publication:
Keyes, C.R., 1896, The geological occurrence of clays: Missouri 
   Geological Survey, v. 11, p. 35-48.

Usage in Publication:
La Motte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview

Summary:
Pg. 35-47. Consists of sandstone, some shale and clay, with conglomerate at base. Underlies Frederickstown dolomite and unconformably overlies Algonkian crystallines.
Source: US geologic names lexicon (USGS Bull. 896, p. 1140).

Publication:
Wheeler, H.A., 1896, Clay deposits: Missouri Bureau of Geology 
   and Mines Report, v. 11, 622 p.

Usage in Publication:
La Motte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Ozark uplift

Summary:
In southeast Missouri, Ozark uplift, La Motte sandstone contains a basal conglomerate composed of waterworn pebbles from underlying crystalline rocks. Thin seam of shale at base. Overlies Algonkian crystalline rocks. Underlies Frederickstown dolomite. Age is Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Keyes, C.R., 1901, Nomenclature of the Cambrian formations of 
   the St. Francois Mountains: American Geologist, v. 28, p. 
   51-53.

Usage in Publication:
La Motte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Ozark uplift

Summary:
Pg. 51-53. [In southeast Missouri, Ozark uplift, the La Motte sandstone is revised to include Iron Mountain conglomerate.] The conglomerate called Iron Mountain conglomerate, by Winslow (1896) should properly be part of La Motte sandstone. It cannot be considered a distinct geologic terrane unless the original signification of title be wholly changed and restricted to the conglomerates encircling the peak of Iron Mountain alone. On same horizon of unconformity and over a large area similar conglomerates occur. They are usually of local extent, and may properly be regarded as local basal facies of La Motte sandstone. [Age is Cambrian.]
Source: US geologic names lexicon (USGS Bull. 896, p. 1140); supplemental information (in brackets) from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Bain, H.F., and Ulrich, E.O., 1905, The copper deposits of 
   Missouri, IN Contributions to economic geology, 1904; Copper: 
   U.S. Geological Survey Bulletin, 260-F, p. F233-F235.

Usage in Publication:
La Motte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview

Summary:
Pg. 21. La Motte sandstone, 0 to 300 feet thick, includes, in St. Francois Mountains, a conglomerate which has been called Pilot Knob conglomerate and Iron Mountain conglomerate. Some regard it as Algonkian, others as a part of La Motte sandstone. It is not older than La Motte sandstone.
Source: US geologic names lexicon (USGS Bull. 896, p. 1140).

Publication:
Wilson, M.E., 1922, The occurrence of oil and gas in Missouri: 
   Missouri Bureau of Geology and Mines Report, 2nd series, v. 
   16, 284 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Ozark uplift Forest City basin Cherokee basin

Summary:
Extended in subsurface through most of Missouri (Ozark uplift, Forest City basin, and Cherokee basin). Is well-bedded, coarse- to fine-grained, yellow, gray, or brown friable sandstone. Shale and conglomerate lenses occur; transitional greenish dolomite beds near top. Thickness is 50 to 400 feet. Overlies Precambrian; underlies Bonneterre formation. Age is Late Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Ver Wiebe, W.A., 1938, Oil and gas resources of western Kansas: 
   University of Kansas Bulletin, v. 39, no. 7., Also, State 
   Geological Survey of Kansas Mineral Resources Circular 10, 
   1938.

Usage in Publication:
LaMotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Anadarko basin Central Kansas uplift

Summary:
In western Kansas, Anadarko basin, Central Kansas uplift, basal sandstone variously called "Basal sand", Reagan sand, or LaMotte sandstone. Underlies Arbuckle; overlies Precambrian rocks. Thickness in one well 330 feet. Composed of white sand with well-rounded grains; basal part arkosic. Age is Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Brightman, G.F., 1938, The Tom Sauk limestone member of the 
   Bonneterre formation in Missouri: Journal of Geology, v. 46, 
   no. 3, pt. 1, p. 248-267, (incl. geologic map), Also, Missouri 
   Acad. Sci. Proc., v. 3, no. 4, p. 120, 1937 [abs.].

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Revised

Summary:
Pg. 250 (tbl. 1), 254. Underlies Tom [Taum] Sauk [limestone] member (new) of Bonneterre formation. [See also Taum Sauk.]
Source: US geologic names lexicon (USGS Bull. 1200, p. 2091).

Publication:
Grohskopf, J.G., Hinchey, N.S., and Greene, F.C., 1939, Subsurface 
   geology of northeastern Missouri; a preliminary report, 
   Appendix 1 OF 60th biennial report 1937-1938: Missouri Division 
   of Geological Survey and Water Resources Biennial Report, 
   no. 60, 160 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Lincoln anticline

Summary:
Extended into subsurface of northeast Missouri, Lincoln anticline. Overlies Precambrian; underlies Bonneterre formation. Thickness is 330 feet in Ralls County. Age is Late Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Lee, Wallace, 1943, The stratigraphy and structural development 
   of the Forest City basin of Kansas: Kansas Geological Survey 
   Bulletin, no. 51, 142 p. [Available online from the Kansas 
   Geological Survey:  http://www.kgs.ku.edu/Publications/
   Bulletins/51]

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Forest City basin

Summary:
Occurs in subsurface of northeast Kansas, Forest City basin. Thickness is 0 to 60 feet. Unconformably overlies Precambrian rocks. Underlies Bonneterre dolomite. Age is Late Cambrian. Report includes columnar sections.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Branson, E.B., 1944, The geology of Missouri: University of 
   Missouri Studies, v. 19, no. 3, 535 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Ozark uplift

Summary:
Pg. 16-18. Gives an overview of lithology and history of the Lamotte in Missouri. Detailed lithology from a well near Bonne Terre. Lamotte is oldest Cambrian formation that appears at surface in Missouri. No complete section exposed. Consists largely of quartz grains varying in color through light-gray, reddish brown, red, green, and shades of yellow. Shale layers a few inches thick common throughout formation. Reagan sandstone of Oklahoma and Hickory sandstone of Texas are probably in part correlatives. Deadwood sandstone of the Black Hills and Flathead sandstone of Wyoming represent similar conditions and time of formation. Overlies Precambrian; unconformably underlies Bonneterre dolomite. Generally accepted age is Late Cambrian.
Source: US geologic names lexicon (USGS Bull. 1200, p. 2091); GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Maher, J.C., 1946, Correlation of Paleozoic rocks across Las 
   Animas arch in Baca, Las Animas, and Otero Counties, Colorado: 
   American Association of Petroleum Geologists Bulletin, v. 
   30, no. 10, p. 1756-1763. [Available online, with subscription, 
   from AAPG archives:  http://www.aapg.org/datasystems or  
   http://search.datapages.com]

Usage in Publication:
Lamotte sandstone*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Las Vegas-Raton basin

Summary:
Tentatively recognized in the subsurface of Las Animas County, Colorado, Las Vegas-Raton basin. Is 15 feet thick in Otero County well. Is the basal Paleozoic sandstone. Report includes correlation chart.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Ireland, H.A., and Warren, J.H., 1946, Maps of northeastern 
   Oklahoma and parts of adjacent states showing the thickness 
   and subsurface distribution of Lower Ordovician and Upper 
   Cambrian rocks below the Simpson group: U.S. Geological Survey 
   Oil and Gas Investigations Map, OM-52, 1 sheet, scale 
   1:506,880

Usage in Publication:
Lamotte sandstone*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Chautauqua platform Cherokee basin Ozark uplift

Summary:
Occurs in subsurface of northeast Oklahoma, southeast Kansas, and southwest Missouri, in Cherokee basin, Chautauqua platform, and on Ozark uplift. Composed of medium to coarse, rounded, frosted quartz grains with a bed of arkose at base. Thickness is 0 to 200 feet. Underlies Bonneterre dolomite; overlies Precambrian. Age is Late Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Keroher, R.P., and Kirby, J.J., 1948, Upper Cambrian and Lower 
   Ordovician rocks in Kansas: Kansas Geological Survey Bulletin, 
   no. 72, 140 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Cherokee basin Forest City basin Central Kansas uplift Sedgwick basin Anadarko basin

Summary:
Has widespread occurrence in subsurface of eastern and western Kansas. Recognized in Cherokee basin, Forest City basin, Sedgwick basin, Anadarko basin, and Central Kansas uplift. Consists of coarse, subangular to rounded, arkosic sand becoming finer in upper part and grading into overlying Bonneterre dolomite. Thickness is 0 to 130 feet. Unconformably overlies Precambrian. Age is Late Cambrian. Report includes columnar sections, cross sections, correlation table.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Lee, Wallace, Leatherock, C., and Botinelly, Theodore, 1948, 
   The stratigraphy and structural development of the Salina 
   basin of Kansas: Kansas Geological Survey Bulletin, no. 74, 
   155 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Salina basin Sedgwick basin Central Kansas uplift

Summary:
Locally occurs in subsurface of Salina basin, Sedgwick basin, and Central Kansas uplift in Kansas, and south-central Nebraska, but is absent in broad areas of central Kansas. Is a coarse, angular to rounded, poorly sorted sand; 0 to 80 feet thick. Underlies Bonneterre dolomite; unconformably overlies Precambrian rocks. Age is Late Cambrian. Report includes columnar table, cross section.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Maher, J.C., 1948, Subsurface geologic cross section from Baca 
   County to Yuma County, Colorado: Kansas Geological Survey 
   Oil and Gas Investigations, Preliminary Cross Section, no. 
   6.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Denver basin Las Animas arch

Summary:
Occurs in subsurface of Kiowa, Cheyenne, and Yuma Counties, eastern Colorado, Denver basin and Las Animas arch. Consists of white, coarse, subrounded quartz grains; lower part contains some feldspar grains. Glauconite common throughout. Thickness is 16-85 ft. Sand also called Reagan sandstone and Sawatch sandstone. Age is Late Cambrian (Croixian). Report includes cross section.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Maher, J.C., and Collins, J.B., 1949, Pre-Pennsylvanian geology 
   of southwestern Kansas, southwestern Colorado, and the Oklahoma 
   Panhandle: U.S. Geological Survey Oil and Gas Investigations 
   Map, OM-101, 4 sheets, scale 1:1,013,760

Usage in Publication:
Lamotte sandstone*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Anadarko basin Las Animas arch Palo Duro basin

Summary:
Occurs in the subsurface in most of southwest Kansas, southeast Colorado, and the Oklahoma Panhandle in the Anadarko basin, Las Animas arch, and Palo Duro basin. Thickness from 0 to 72 feet, increasing to north. Texture grades from fine to coarse in same direction. Consists of white, subround to subangular quartz grains; contains glauconite; very dolomitic in places; grades upward into Bonneterre dolomite. Unconformably overlies Precambrian rocks. Age is Late Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Moore, R.C., Frye, J.C., Jewett, J.M., Lee, Wallace, and O'Connor, 
   H.G., 1951, The Kansas rock column: Kansas Geological Survey 
   Bulletin, no. 89, 132 p.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview

Summary:
Pg. 106 (fig. 42), 120 (fig. 51), 122. Lamotte sandstone. The sand grains composing the Lamotte are ill sorted, rounded to angular, and coarse to fine. Arkosic material occurs in lower part adjacent to Pre-Cambrian rocks. The Lamotte sandstone was deposited unconformably on a complex of Pre-Cambrian rocks which formed an uneven surface of very low relief. The formation is widespread in Kansas beneath the Bonneterre but locally Bonneterre overlaps on the Pre-Cambrian surface. Thicknesses of 80 to 130 feet have been reported in southeastern Kansas but the average thickness is about 20 feet. Occurs in subsurface of Kansas. Age is Cambrian.
Source: Publication.

Publication:
Summerson, C.H., 1951, Cambrian tracks in the Lamotte sandstone: 
   Journal of Paleontology, v. 25, no. 4, p. 533.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Biostratigraphic dating	Ozark uplift

Summary:
In Madison County, Missouri, Ozark uplift, tracks identified as CLIMACTICHNITES and PROTICHNITES found in the lower part of the Lamotte indicate age of early Late Cambrian. Correlated with Mount Simon sandstone of Wisconsin and Potsdam sandstone of New York. Age is Late Cambrian.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Collins, J.B., 1952, Subsurface cross section of pre-Pennsylvanian 
   rocks from Morton County, Kansas, to Gray County, Texas: U.S. 
   Geological Survey Oil and Gas Investigations Chart, OC-47, 
   1 sheet.

Usage in Publication:
Lamotte sandstone*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Anadarko basin

Summary:
Described from well in Roberts County, Texas, in the Anadarko basin. Is 86 feet thick. Upper 50 feet consists of dolomitic sandstone; lower 36 feet consists of glauconitic, conglomeratic sandstone. Correlated with Reagan sandstone of Oklahoma and Sawatch quartzite of Colorado. Underlies Arbuckle; overlies Precambrian. Age is Cambrian.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
McCoy, A.W., 1953, Tectonic history of Denver basin: American 
   Association of Petroleum Geologists Bulletin, v. 37, no. 8, 
   p. 1873-1893. [Available online, with subscription, from AAPG 
   archives:  http://www.aapg.org/datasystems or  http://
   search.datapages.com]

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Denver basin Las Animas arch Chadron arch

Summary:
Occurs in subsurface in eastern Colorado, western Kansas, and northwestern Nebraska in Denver basin, Las Animas arch, and Chadron arch. Lithologic equivalents are Sawatch, Ignacio, Lodore, and Deadwood sandstones. Overlies Precambrian; underlies Cambro-Ordovician Arbuckle limestones. Age is Late Cambrian. Report includes isopach map.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Grohskopf, J.G., 1955, Subsurface geology of the Mississippi 
   embayment of southeast Missouri: Missouri Division of Geological 
   Survey and Water Resources Report, 2nd series, v. 37, 133 p.

Usage in Publication:
Lamotte(?) formation

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Upper Mississippi embayment

Summary:
Uses Lamotte(?) formation. An unfossiliferous quartzite which may be a correlative of the Lamotte sandstone was penetrated in Strake well (log no. 1, Pemiscot County) and Marr well (log no. 11, Stoddard County). Also encountered quartzite in lower part of well in Lake County, Tennessee (Markham well, log no. T6). Consists of dark-gray, extremely fine-grained, hard and compact, and somewhat calcareous and dolomitic quartzite. [Gradationally underlies] a limestone and calcareous and dolomitic shale that contain fossils commonly found in outcrop exposures of the Bonneterre formation near Farmington, Missouri. Lower part of Bonneterre is somewhat quartzitic and contact with underlying quartzite is gradational. Because of this gradational contact, its stratigraphic position, and geographic proximity to known Lamotte, in Ozark escarpment to the northwest, this quartzite is believed to be equivalent to Lamotte sandstone. It may later prove to be equivalent to Middle Cambrian quartzite of Alabama.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Bergstrom, R.E., and Zeizel, A.J., 1957, Groundwater geology in 
   western Illinois, south part: Illinois Geological Survey 
   Circular, no. 232.

Usage in Publication:
Lamotte sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Illinois basin

Summary:
In subsurface of western Illinois, Illinois basin, basal Cambrian sandstone is called Lamotte sandstone. Correlates with [Mount Simon] sandstone. Overlies Precambrian; underlies [Bonneterre] formation. Age is Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Howe, W.B. (coordinator), and Koenig, J.W. (editor), 1961, The 
   stratigraphic succession in Missouri: Missouri Division of 
   Geological Survey and Water Resources Report, 2nd series, v. 
   40, 185 p.

Usage in Publication:
Lamotte Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised Overview	Ozark uplift

Summary:
Revised to Lamotte Formation in Missouri because Missouri Geological Survey believes that most established formational units are now known to be more or less multi-lithic in character; therefore use of the word "formation" is preferable. Consists of predominantly quartzose sandstone that grades laterally into arkose and conglomerate. Locally includes shale and lenses of arenaceous dolomite. Exposures restricted to St. Francois Mountains area in Madison, Ste. Genevieve, Iron, and southeastern Washington Counties. Persistent in subsurface throughout Missouri except on Precambrian highs.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Ojakangas, R.W., 1963, Petrology and sedimentation of the Upper 
   Cambrian Lamotte Sandstone in Missouri: Journal of Sedimentary 
   Petrology, v. 33, no. 4, p. 860-873. [Available online, with 
   subscription, from AAPG archives:  http://www.aapg.org/datasystems 
   or  http://search.datapages.com]

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Ozark uplift

Summary:
Report provides detailed petrologic study of the Lamotte Sandstone in southeastern Missouri, Ozark uplift. Lamotte is a time-transgressive marine orthoquartzite containing arkose sandstone and conglomerate in lower part. Reagan Sandstone and [Mount Simon] Sandstone are time-transgressive equivalents. Overlies Precambrian rocks; grades into overlying Bonneterre Dolomite. Age is Late Cambrian. Report includes isopach map, geologic map.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Goebel, E.D., 1968, Paleozoic Era; [Cambrian through Mississippian 
   Systems], IN Zeller, D.E., ed., The stratigraphic succession 
   in Kansas: Kansas Geological Survey Bulletin, no. 189, p. 
   11-21. [Available online from the Kansas Geological Survey: 
   http://www.kgs.ku.edu/Publications/Bulletins/189]

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview

Summary:
Pg. 12. Lamotte Sandstone. The Lamotte is a basal Paleozoic sandstone. The sand grains composing the Lamotte are poorly sorted, rounded to angular, and coarse to fine. Quartzose sandstone, dolomitic sandstone, quartz-glauconite sandstone, arkose, and feldspathic sandstone are the dominant rock types, Arkosic material occurs in the lower part adjacent to Precambrian rocks. The Lamotte Sandstone was deposited unconformably on a complex of Precambrian rocks that formed an uneven surface of low relief. The formation is widespread in Kansas beneath the Bonneterre, but locally the Lamotte is absent and the Bonneterre lies on the Precambrian. Absence of the Lamotte locally in the area of the Central Kansas uplift and the Cambridge arch is attributed to post-depositional erosion. Thicknesses of 80 to 130 feet have heen reported in southeastern Kansas, and as much as 175 feet in western Kansas, but the average thickness is about 40 feet. [Age is Late Cambrian.]
Source: Publication.

Publication:
Howe, W.B., Kurtz, W.E., and Anderson, K.H., 1972, Correlation 
   of Cambrian strata of the Ozark and upper Mississippi Valley 
   regions: Missouri Division of Geological Survey and Water 
   Resources Report of Investigations, no. 52, 60 p.

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Ozark uplift

Summary:
Recent work shows that Lamotte Sandstone may be partly pre-Late Cambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Willman, H.B., Atherton, Elwood, Buschbach, T.C., and and others, 
   1975, Handbook of Illinois stratigraphy: Illinois Geological 
   Survey Bulletin, no. 95, 261 p.

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Ozark uplift

Summary:
Table on p. 39 shows current preference of the Illinois Geol. Survey is to use [Mount Simon] Sandstone instead of Lamotte Sandstone.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Kurtz, V.E., Thacker, J.L., Anderson, K.H., and Gerdemann, P.E., 
   1975, Traverse in Late Cambrian strata from the St. Francois 
   Mountains, Missouri to Delaware County, Oklahoma: Missouri 
   Geological Survey Report of Investigations, no. 55, 112 p.

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Age modified Overview	Ozark uplift

Summary:
In subsurface in southern Missouri, Ozark uplift, thickness extremely irregular; reflects paleotopography of Precambrian. Pinches out to west at Taney-Stone County line, Missouri, or may in part merge with time-transgressive Reagan Sandstone. Underlies Bonneterre Formation; overlies Precambrian. Age is Middle Cambrian(?); is older than Cedaria zone.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Thompson, T.L., 1995, The stratigraphic succession in Missouri 
   (Revised-1995): Missouri Division of Geology and Land Survey, 
   2nd series, v. 40 Revised, 188 p.

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview

Summary:
Pg. 18. Lamotte Sandstone. Is predominantly a quartzose sandstone that in many places grades laterally into arkose and conglomerate. Pebbles and boulders of felsite are chief constituents of the conglomerates which immediately overlie Precambrian rocks in many places. Color of the sandstone ranges from light-gray or white to yellow, brown, or red. Red to purple, silty shale is locally present, and lenses of arenaceous dolomite are scattered throughout upper part of formation. Thickness 200 feet in Howell County, 300 feet in Laclede County; 125 feet in Barry County, and 340 feet in Ralls County. Maximum thickness about 500 feet in depressions between Precambrian ridges and knobs. Where formation onlaps these knobs and hills, it pinches out and is overlapped by younger formations. Exposures of Lamotte generally restricted to St. Francois Mountain area, Madison, Ste. Genevieve, Iron, and southwestern Washington Counties. Is persistent in subsurface throughout Missouri, except on Precambrian highs. Has been quarried for dimension stone in St. Francois Mountain area.
Source: Publication.

Publication:
Harrison, R.W., 1997, Bedrock geologic map of the St. Louis 30' 
   x 60' quadrangle, Missouri and Illinois: U.S. Geological 
   Survey Miscellaneous Investigations Series Map, I-2533, 7 
   p., 2 sheets, scale 1:100,000 [http://ngmdb.usgs.gov/Prodesc/
   proddesc_13024.htm]

Usage in Publication:
Lamotte Formation*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Illinois basin Ozark uplift

Summary:
Revised to Lamotte Formation. Present in subsurface, St. Louis area, Missouri and Illinois. Age is Late Cambrian (Croixian).
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Nelson, W.J., 1998, Bedrock geology of the Paducah 1 degrees x 
   2 degrees CUSMAP quadrangle, Illinois, Kentucky, and Missouri, 
   IN The Paducah CUSMAP quadrangle, resource and topographical 
   investigations: U.S. Geological Survey Bulletin, 2150-B, p. 
   B1-B36, (incl. geologic map, scale 1:100,000), A joint study 
   conducted with the Illinois Geological Survey, Indiana 
   Geological Survey, Kentucky Geological Survey, and Missouri 
   Geological Survey. [http://ngmdb.usgs.gov/Prodesc/
   proddesc_19757.htm]

Usage in Publication:
Lamotte Sandstone*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Ozark uplift

Summary:
Deep boreholes in Paducah quadrangle penetrated Cambrian (Croixian) Lamotte Sandstone of Missouri or the correlative Mount Simon Sandstone of Illinois.
Source: GNU records (USGS DDS-6; Denver GNULEX).

Publication:
Thompson, T.L., 2001, Lexicon of stratigraphic nomenclature in 
   Missouri: Missouri Division of Geology and Land Survey Report 
   of Investigations, no. 73, 371 p.

Usage in Publication:
Lamotte Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Overview

Summary:
Pg. 162. Dake (1930, [Missouri Bur. Geol. and Mines, 2nd ser., v. 23,] p. 44) stated "The name is derived from old Mine La Motte [Madison County, Missouri], and was proposed by Winslow for the series of basal sandstones overlying the crystallines and below the limestone beds [Bonneterre Formation] in which lead ores are found." A specific type section has never been designated. Winslow (1894, p. 347) stated "Immediately overlying the Archean [Precambrian] crystallines is a great body of sandstone. This sandstone we have named the La Motte sandstone, and we consider it the basal member of the series." He regarded the "La Motte" to be Silurian in age. The lowest (and oldest) formation of the Upper Cambrian Series, the Lamotte is overlain by carbonates of the Bonneterre Formation and underlain by Precambrian rocks. It has been used essentially the way it was first defined, except that it is now written "Lamotte" instead of "La Motte." It is equivalent to the Mt. [Mount] Simon Sandstone of states to the north.
Source: Publication.