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Glacier National Park

Photos 526 to 550 of 835.
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526. mrg00008.gif Glacier National Park, Montana. Intense soft-sediment deformation produced during pillow emplacement at Granite Park. The pillow in the lower right corner is entirely buried. The basal contact of the Purcell lava with the Snowslip Formation is, thus, locally very irregular. 1982. Figure 9-B, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.   8ct
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527. mrg00011.gif Glacier National Park, Montana. Hyaloclastite tuff beds, about 1 centimeter thick, interlayered with Snowslip sediment at basal contact with pillow lava on Kootenai Peak. The mass in the upper right corner is the edge of the pillow. 1982. Figure 11, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  11ct
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528. mrg00012.gif Glacier National Park, Montana. Large (greater than 2 meters), massive zone in the pillowed unit on Kootenai Peak. The zone has slightly rounded borders and lies amid pillows that are, in general, less than 1 meter in diameter. Massive zones in the pillow lava unit represent either congealed feeder tubes or exceptionally large pillows. Photo mrg00013 is a close-up of the lower center part of this photograph. 1982. Figures 12-A (upper photo), U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  12ct
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529. mrg00013.gif Glacier National Park, Montana. Large (greater than 2 meters), massive zone in the pillowed unit on Kootenai Peak. The zone has slightly rounded borders and lies amid pillows that are, in general, less than 1 meter in diameter. Massive zones in the pillow lava unit represent either congealed feeder tubes or exceptionally large pillows. This photograph is a close-up of the lower center part of photo mrg00012. 1982. Figures 12-A (lower photo), U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  13ct
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530. mrg00014.gif Glacier National Park, Montana. Massive zone, 2 miles in diameter, with well rounded borders on Kootenai Peak. Note the well-developed pipe vesicles at the base. 1982. Figure 12-B, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  14ct
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531. mrg00015.gif Glacier National Park, Montana. Cross section of a pillow, showing thick concentrically layered, hyaloclastite breccia that probably formed from incomplete spalling during pillow implosion. Collected from the Apgar Mountain section. 1982. Figure 13, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  15ct
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532. mrg00016.gif Glacier National Park, Montana. Subspherical vesicles concentrically arranged about the perimeter of a small pillow at Granite Park. Note the radial cooling cracks. 1982. Figure 14-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  16ct
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533. mrg00017.gif Glacier National Park, Montana. Pipe vesicles concentrically arranged about the perimeter of a pillow at Granite Park. Pillow is surrounded by hyaloclastite breccia. 1982. Figure 14-B, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  17ct
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534. mrg00018.gif Glacier National Park, Montana. Cross sectional view of interconnected pillows at Hole-in-the-Wall. 1982. Figure 16, U.S. Geological Survey Open- File Report 85-543. ID. McGimsey, R.G.  18ct
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535. mrg00020.gif Glacier National Park, Montana. Elongate, closely-packed, tubular pillows at Granite Park. 1982. Figure 17-B, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  20ct
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536. mrg00021.gif Glacier National Park, Montana. Bulbous and cylindrical pillows at Hole-in- the-Wall. 1982. Figure 18, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  21ct
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537. mrg00022.gif Glacier National Park, Montana. Elongate, sinuous pillow at Fifty Mountain section. The material between the pillows is hyaloclastite breccia. 1982. Figure 19-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  22ct
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538. mrg00024.gif Glacier National Park, Montana. Dip slope less than 1 kilometer south of the campground at Fifty Mountain. Elongate, sinuous pillows that form a tangled, entrail-like mass. Individual pillows are traceable for up to 2 meters before disappearing into the conglomeratic mass. 1982. Figure 19-C, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  24ct
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539. mrg00025.gif Glacier National Park, Montana. Pinching and swelling of pillows during lateral budding produced this "neck and bulb" shape in the Fifty Mountain area. The "neck" is left of the hammer. 1982. Figure 20-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  25ct
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540. mrg00026.gif Glacier National Park, Montana. Elongate, sinuous pillow that abruptly changed direction during budding in the Fifty Mountain area. 1982. Figure 20-B, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  26ct
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541. mrg00027.gif Glacier National Park, Montana. Isolated-pillow breccia that occurs in the upper part of the pillowed unit at Granite Park. The subunit is characterized by irregularly-shaped, widely spaced pillows that are surrounded by voluminous hyaloclastite breccia. 1982. Figure 21-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  27ct
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542. mrg00029.gif Glacier National Park, Montana. Broken-pillow breccia within the pillowed unit at Granite Park. Pillow fragments rest in a matrix of hyaloclastite breccia. 1982. Figure 22, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  29ct
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543. mrg00030.gif Glacier National Park, Montana. Tongue-like pillow in the coalesced pillow zone near the top of a pillowed unit at Hole-in-the-Wall. The coalesced pillow zone marks the transition from the pillowed unit to the pahoehoe unit. 1982. Figure 23-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  30ct
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544. mrg00031.gif Glacier National Park, Montana. Coalesced pillows at the transition from pillowed unit to pahoehoe unit. The hammer rests on a small, isolated patch of hyaloclastite breccia, the presence of which suggests that the mass was emplaced under or into water. How far underwater? Note the fluidal banding and flow structures. The lava that formed these pillow masses was not quickly chilled but instead remained hot and fluid long enough to spread laterally and coalesce with the adjacent masses. This suggests that the lava was emplaced at or near the water surface. 1982. Figure 23-B, U.S. Geological Survey Open- File Report 85-543. ID. McGimsey, R.G.  31ct
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545. mrg00032.gif Glacier National Park, Montana. Ropy texture of pahoehoe toes at the transition from the pillowed unit to the pahoehoe unit at Fifty Mountain. 1982. Figure 24, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  32ct
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546. mrg00033.gif Glacier National Park, Montana. Cross sectional view of the transition from the upper pillow unit to the pahoehoe unit at Fifty Mountain. Zone in the center is the coalesced pillow subunit. 1982. Figure 25-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  33ct
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547. mrg00035.gif Glacier National Park, Montana. Interpillow hyaloclastite breccia (samples). Fragments are chloritized subrounded globules and sharp-pointed shards. The sample on the left is 5 centimeters across. 1982. Figure 26, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  35ct
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548. mrg00036.gif Glacier National Park, Montana. Erosionally-truncated flow units form a stair- stepped slope at Hole-in-the-Wall. The Purcell lava was referred to only as "trap" by early workers like Dawson and Bauerman, a term used to describe any dark-colored, fine-grained, nongranitic hypabyssal or extrusive rock. The term originated from the Swedish word "trappa" meaning stair-stepped. 1982. Figure 27, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  36ct
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549. mrg00037.gif Glacier National Park, Montana. Tabular flow unit in the pahoehoe unit of the Purcell lava at Granite Park. 1982. Figure 28-A, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  37ct
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550. mrg00038.gif Glacier National Park, Montana. Lenticular flow units at Granite Park. Regional dip of the strata is 15 to 20 degrees towards the left. 1982. Figure 28-B, U.S. Geological Survey Open-File Report 85-543. ID. McGimsey, R.G.  38ct
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