Core description and related data from Atlantic Richfield Company Core Hole 2B Federal drilled in Eocene Green River Formation, Piceance Creek basin, northwestern Colorado

Abstract

Oil shale, brown to gray, varved, graded fair Tuff, tan, calc, irr top and base Oil slinle, brown to dk gray, varved, graib mod Tuff, tan extremely irr Interbedded mar Is Lone and tuff, abundant contorted bed Oil shale, dk brown to dk gray, grade mod. abundant thin numerous bods of tuff, contorted bedding, many dikes Oil shale, tan to dk gray, grade fair to mod, contorted bedding, numerous tuff beds (est. 40%), lower 5' contains less contorted beds than above, 1/8" siltston at base, dk brown, spotted white, very even top and bottom. Oil shale, tan to dk brown, grade fair to mod, slightly less than above, contain numerous tuff laminae, some irr bedding, tuff bed -top at 1112.1 (1/8" thick)tuff dk brown spotted white, even top and slightly irr base core msg 1113.4-1114.0