Loc. 25 Bullhead. Section I. Main bluff (westernmost) - N of River Begins at "upper ls. conc. zone" and ascends. 1 15.3 (massive clayey silt + sand zone) At base Dark gray to brownish gray clayey silt, finely sandy. Has mottled Fe stain. Sandy patches + plant frags, scat, throat Zone etc. gray to blue-gray ls concs at base, which have light gray chalky to yellowish rind. & commonly Fe stain on outer surface. Some yellow sulphur mottling. Becomes increasingly siltier and sandier upward. At top is a sandy gray silt; mottled with brngrey shely silt blebs.. 118.0 { 2 35.5 Banded silty brn-gray shale with finely broken up plant frags, and lzmizu + thin beds of fine ss and sandy siltstone - light gray. Some orange brn Fe stain on sandy layers. Occasional lease of semi-indurated sandy silt, - platy frizble, plant frags common, weather platy gray. Becoming sandier in upper 10't 3 16.5 As below but sand predominates, is a buff-weather sand here whereas 22