GEOLEX

Summary of Citation: Bullis

Publication:
McCollum, L.B., 1991, Revised stratigraphy, sedimentology, and
   paleoecology of the Ledyard Member, Ludlowville Formation,
   New York, IN Landing, Ed, and Brett, C.E., eds., Dynamic
   stratigraphy and depositional environments of the Hamilton
   Group (Middle Devonian) in New York State, Part II: New York
   State Museum Bulletin, no. 469, p. 107-128

Usage in Publication:
Bullis trilobite beds

Modifications:	Geologic Province:	Dominant Lithology:
Named	Appalachian basin	Shale

Summary:
Ledyard Member of Ludlowville Formation subdivided into newly named Winspear and Elma Submembers. Bullis trilobite beds are 25 to 50 cm thick and occur within the Elma, between 19.5 and 21 m above the base of the Ledyard in every locality studied by author. The Bullis is described as a faunal interval of densely crowded trilobite carapaces and small pectinid bivalves within an otherwise uniform shale sequence. Underlies Pond Brook interval (new). Age is Middle Devonian.