Page:Field Notes of Junius Henderson, Notebook 1.djvu/67

 about 125, some , , and other fossils in limestone concretions near base of the exposure and , , shark teeth, fish vertebrae and scales, , , , , etc. in the upper part of the exposure. The lower part of the exposure may be Pierre but the upper part is the typical greenish-yellow Fox Hills sandstone as is exposed below White Rock, with large concretions of sandstone with iron cement, flaking off horizontally in large scales practically the size of the concretions. The sandstone is quite soft, easily excavated with a knife. The were well preserved, though thin, and valves were easily freed from sand on both sides with the knife. The other fossils were friable, the shell crumbling, leaving only casts. Some of the are very fine. The lower part of the exposure consists of alternating strata of thin bedded clay shales and sandstones, with lime-