New Reptiles And Stegocephalians From the Upper Triassic of Western Texas
New Reptiles And Stegocephalians From the Upper Triassic of Western Texas
E C Ermine Cowles Case
The book New Reptiles And Stegocephalians From the Upper Triassic of Western Texas was written by author E C Ermine Cowles Case Here you can read free online of New Reptiles And Stegocephalians From the Upper Triassic of Western Texas book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is New Reptiles And Stegocephalians From the Upper Triassic of Western Texas a good or bad book?
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Near the specimen, and in the same kind of matrix, occur large numbers of fragmentary bones, teeth, and coprolites. This small patch is evidently a bit of an old sand-bar, or an accumulation of sandy clay in some small depression which has been well leached by percolating waters. The relatively small percentage of clay rendered the matrix easily permeable by the waters which converted the iron into limonite and in spots removed it so completely that the matrix is pure white; in other spots the ...matrix is still purple from the unchanged iron of the original deposit. The limonite was con- centrated upon the bones, covering them with a thin scale, and was deposited in the cracks between the pieces of the broken bones. Movements in the ground crushed the skull and broke it into many small pieces which are slightly displaced. The cleaning and restoration were rendered difficult by the distortion and breaking of the bones, but as the fragments were only slightly displaced it was possible to harden the matrix or replace it by plaster cement and work out the original form of the skull.
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