. Annual report of the United States Geological Survey to the Secretary of the Interior . CHARACTERISTIC FOSSILS OF THE GLEN ROSE , Lunatia (Tylostoma) pedernalis Roemer; 2((, 2b, Cyprina? mediale Conrad. UNIVf^i PLATE XXVI. PLATE XXVI. Characteristic Plants op the Trixity Division. 1. Pagiophyllum dubium sp. nov. 2. Pagiophyllum dubium sp. nov. 3. Podozamites acutifolius 4. Sequoia pagiophylloides sp. nov. 5. Laricopsis longifolia Font. 6. Podozamites 7. Zamites tenuinervis Font. 8. Frenelopsis varians sp. nov. ig. 9. Sphenolepidium sternbergianunvar. densifolium Font. 10. W
. Annual report of the United States Geological Survey to the Secretary of the Interior . CHARACTERISTIC FOSSILS OF THE GLEN ROSE , Lunatia (Tylostoma) pedernalis Roemer; 2((, 2b, Cyprina? mediale Conrad. UNIVf^i PLATE XXVI. PLATE XXVI. Characteristic Plants op the Trixity Division. 1. Pagiophyllum dubium sp. nov. 2. Pagiophyllum dubium sp. nov. 3. Podozamites acutifolius 4. Sequoia pagiophylloides sp. nov. 5. Laricopsis longifolia Font. 6. Podozamites 7. Zamites tenuinervis Font. 8. Frenelopsis varians sp. nov. ig. 9. Sphenolepidium sternbergianunvar. densifolium Font. 10. Williamsonia texana sp. nov. 11. Equisetum texense sp. nov. 12. Brachyphyllum texense sp. nov. 13. Brachyphyllum texense sp. nov. 14. Frenelopsis varians sp. nov. 164 U. S. GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PART v|| PL. XXVI. FOSSIL PLANTS FROM THE BASE OF THE GLEN ROSE FORMATION, GLEN ROSE, TEXAS. UNIVERSITY of ILLINOIS HILL.] FOSSIL PLANTS OF THE TRINITY DIVISION. 165 the upper beds of the Glen Rose at Lampasas there are many smallbivalves of the form described as Chione decepta by the writer. Nerineas especially abound in the upper part of the Glen Rose are first noted as a conspicuous zone in the Glen Rose section atGranbury. In the Colorado sections they are rather abundant as fardown as 100 feet below the top. Ammonites, which occur more or less frequently through all theother formations, are conspicuously absent, and gryphgeate oysters,which commence in the beds above, are also notably lacking. Fossil plants.—There are many silicified and lignitized trunks in theBasement sands of the western border region which have been butlittle examined by the paleontologists, some of which were depositedsynchronously with the more calcareous beds of the valley are most probably the he
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