Geological Survey of Pennsylvania; Upper Silurian and Devonian Formations, by J.P. Lesley

Geological Survey of Pennsylvania; Upper Silurian and Devonian Formations, by J.P. Lesley

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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. 1892 edition. Excerpt: ...p. 255.) The sea weeds are of the Spirophyton type. The hornstone is shown by Dr. White to be full of microscopic plants (1-500 to 1--5000th of an inch) mixed with the needle-like skeletons of sponges, and the minute teeth of shell fish. (Dana gives pictures of them in Fig. 484 A. p. 257 of his Manual.) The land plants of the day were Lycopods (ground pines), Psilopltg/ton like those of the preceding Oriskany period, with flowering stems but no leaves; also conifers. the earliest known genus Prototawites; also ferns Oaulopteris antiqua, Newb. Qf animals we have the sponge spicules of the flint stones; cup corals, 0'3/atkophg/lla; honey-comb corals, Favosites, ' bud crinoids, Blastidea (like the armless and stemless Nucleocrimus cerneullii) predicting the innumerable Peninmites of the Coal Measures; brachiopod shells, Productus, which became so abundant in the Carboniferous age; gasteropods Platyceras, and their teeth; lamellibranch shells, Lucina, Conocardium. Solenomya, Orthonema; Pteropods, Tentaculites, ' cephalopods, Oyrtoceras; articulates. the trilobites Dalmanites, Proetus, Phacops; fishes, sharks, Machwracanthiis, Spinaw, Oestraceon; ganoids, Holoptychins, Ong/chodus, Oephalaspis, Placodus, Rkynckodus. (See figures in Dana's Manual, pp. 263, 264.) Phacops rana and Atrg/pa reticnlaris? were found by Claypole in Marcellus (U. Helderberg i) limestone at Smith's quarry, Perry county (O3, p. 137).--Strophodontaperplana and demissa, and Leiorhg/nchns rnnlticostatum, at Pine Grove (p. 148).--Amboca=lia umbonata and a Bellerqokon, at Falling Spring (p. 158).--P. rana, a Proetus, a Fenestella, a mile N. E. of Bridgeport (p. 161).--Tentacnlites scalariformis from acknowledged Corniferous strata at Stroudsburg, Monroe county (p. 164). The...
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Product details

  • Paperback | 276 pages
  • 189 x 246 x 15mm | 499g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236543920
  • 9781236543929