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Jurrasic shale cylinders with a square hole down the center (??)
Richard Beale posted a topic in Fossil ID
I live in the Western Sierra Nevada region of California near (on) the Mariposa Formation. I find ammonites, belemnites and buchia (common Jurassic bivalve). I also find cigar shaped somethings (fossils?) in the same strata. They come in many sizes with the larges about the diameter of a US quarter (as are the ones in the picture), down to only a few mm diameter, and their length is one to six cm. The always have a very square hole running down the length of the center. The first time I found one I thought there had been a pyrite crystal that had been chemically dissolved from the center of a concretion, but the wholes are only square in cross section, they pretty much always go the length of the cigar shape. These come from Oxfordian Jurassic shale with the other common fossils listed above. I'll be going back to the main site to collect more Tuesday and hop to post more. Any identification help would be appreciated! Richard
