Coal Geology of the Paleocene-Eocene Calvert Bluff Formation (Wilcox Group) and the Eocene Manning Formation (Jackson Group) in east-central Texas

Edited by P.D. Warwick and S.S. Crowley

U.S. Geological Survey Open-File Report 95-595

Figure 8. Photomicrograph of a siliceous sponge spicule from the base of the 3500 bed (sample 3500.5, fig. 3). Scale bar = 25m

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