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Paul Franklin Morse __________________________________________________________ _
B The Stratigraphy of the Trinity Division as exhibited
Ripple Marks of Large Size in the Fredericksburg Rocks
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aguilerae ambulacra ambulacral grooves Big Lake Oil Black shale brachiopods brown limestone Bryozoa calcareous cap rock chert clay conglomerate containing costae costellae Creek Cretaceous crinoid crinoid stems cubic feet Dark gray dark shale Depth in feet dome dorsal Douvillé drilled Durania elevated elongated Eoradiolites ﬁgure ﬁne ﬁrst ﬁve fossils Four samples fragments fusulinids genus Géol Geology Glen Rose gray limestone gray sandstone gray to black green shale Gumbo Harpersville holotype horizon identiﬁed Jack County Lake Oil Company layers lower Macraster Marathon series miles Montague County nodopyga obesus Oil and Land oil ﬁeld Ordovician ostracoda Paluxy Paratype Parker County Pennsylvanian periproct peristome Permian pores posterior production pseudoelegans quartz ridge Rudistes sandstone sandy shale shale and brown shallow shell Shumard Silurian sink siphonal bands slightly species strata surface texanus Texas Texas Bull Texon Texon Oil thickness thin tuberculate Ulrich unconformity upper ventral Washita zone