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Science 17 November 1967:
Vol. 158. no. 3803, pp. 905 - 906
DOI: 10.1126/science.158.3803.905
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Articles

Tridymite Pseudomorphs after Wood in Virginian Lower Cretaceous Sediments

Richard S. Mitchell 1

1 Department of Geology, University of Virginia, Charlottesville

Fossil wood composed of tridymite is abundant in Patuxent (Lower Cretaceous) arkose on Hazel Run, Fredericksburg, Virginia. X-ray diffraction studies of the tridymite indicate that it has a disordered structure in which hexagonal close packing predominates. The specimens, which contain trace amounts of aluminum, iron, and other elements, are soft and fibrous, varying from white to shades of brown.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)