1921] Prick: Faunas of Bautista Creek and San Timoteo CaTwn 337 



Occurrence 



Fossils have been found in place in the Eden in the following 

 deposits : 



1. In yellowish to greenish gray and somewhat micaceous sand- 

 stone. 



2. In hard, bluish to greenish sandy shale. 



3. In a particular calcareous sandy shale of variable texture. 



4. In nodules of fine sandy clay of flint-like hardness. 



No trace of fossil material was found about the well rounded and 

 typical ridges of hard, compact, bluish-green shales, where the even 

 surface and thin, downward-moving mantle of weathered gravels 

 seemingly affords little opportunity for material to collect. At three 

 localities nodules occurring in the neighborhood of interbedded ledges 

 of sandstone and of hard nodular calcareous clays outcropping through 

 ridges to west and southeast have been found to contain associated 

 skeletal remains of individual camels. 



The two localities which have yielded the greatest amoiTnt of the 

 best fossil material, and which at the same time show the best sections, 

 are : the exposure to the northwest side of the ravine, a fourth of a 

 mile north of Eden Springs, near the contact with the brown-gray 

 sandstone of the overlying formation; and the ledges on the shoulder 

 of the mountain, one-half of a mile farther to the southeast. The 

 Eden ravine section consists of massive sandstones in the creek bottom, 

 followed by seventy feet of typical Eden deposits (light bluish-green 

 shales, interbedded wdth layers of coarse to fine and clayey laminated 

 sandstone and nodular calcareous clays) unconformably overlain by 

 the lighter textured beds of the San Timoteo. The fossil material of 

 this locality was traced through the wash, and dug from a tough, sandy 

 shale of greenish-grey tinge. The matrix varied in texture from 

 coarse to fine and floury, the finest containing quartz grains and small, 

 rounded pebbles. The many rounded fragments of bone, and the small, 

 flat stones lying in contact with more perfectly preserved fragments 

 indicate the origin to be one of stream collection and deposition. 

 This northwest-dipj)ing section apparently stratigraphically overlies 

 the more gently northwest- to horizontal-trending strata of the faulted 

 ledges occurring on the mountain shoulder a half mile to the south- 

 east, the same resting, as already mentioned, in direct contact with 

 metamorphic limestone of the mountain complex. Lithologically the 



