Geological Survey bulletin Volume 1118

 
9781235968556: Geological Survey bulletin Volume 1118

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: ... at map localities 8 and 20 are called early Pliocene(?) by G. E. Lewis (written communication, 1956), who identified these teeth as follows: Map locality 8: Hard-rock phosphate mine in SW%NW sec. 21, T. 9 S., R. 17 E., Alachua County. Sample 277 from phosphatic clayey sand. Undetermined bone fragments 3 fragments of upper cheek teeth 2?very much worn cheek teeth of INannippus aff..V. minor 1 fragment of carapace of IGopherus sp. Map locality SO: Hard-rock phosphate mine in SW%SW sec 4, T. 14 S., R. 19 E., Levy County. Sample 181 from phosphatic sand, 8 feet below top of bed. Much-worn upper cheek tooth of Nannippus cf. TV. minor. Lewis states: If these horse teeth do in fact represent much-worn Nannippus teeth, I would judge their age to be early Pliocene. However, the upper cheek teeth of Nannippus are very highcrowned when little worn (35 to 75 mm high), and have a discrete protocone almost to the base of the crown, whereas these Alachua and Levy County specimens are 19 (No. 181), 15 and 13 (No. 277) mm high at the paracone, and in the Alachua County specimens (No. 277) the protocone is connected to the protoconule as in the genus and subgenus Merychippus (Protohippus). Therefore, the remote possibility exists that No. 277 might be secondarily derived Merychippus aff. M. gunteri from the early Middle Miocene Hawthorn formation. The discrete protocone and very complicated enamel patterns of the fossettes of No. 181 make its reference to Nannippus much more probable. According to Simpson (1929), vertebrate fossils of Miocene age have been found in one phosphate deposit near Newberry, vertebrate fossils of early Pliocene age have been found at 6 localities in the hard-rock district, and Pleistocene vertebrates have also been found at various places in the distri...

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