Maryland Geological Survey; PT.1] Lower Devonian, Text

Maryland Geological Survey; PT.1] Lower Devonian, Text

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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. 1913 edition. Excerpt: ... 14. Ventral valve. Evitts Creek. 15. Portion of the same near the umbo, showing the intercalation of radiating and fine concentric striae. X 8. 16. Partly exfoliated ventral valve showing one cardinal spine. X 1'4 Iron Bridge over Town Creek, northeast of Oldtown. 17. Interior of ventral valve. X 1%. McCoys Ferry. 18. Interior of dorsal valve. X 2. Hancock-Harrisonville Road, 2 miles north of Hancock. 19-20. Exteriors of ventral valves. X 2. Same locality. 21. Interior of the dorsal valve. X 3. Same locality. Romney formation, Hamilton member. PAGE Figs. 1-6. Chonetes Marylandicus Prosser n. sp 157 1. Partly exfoliated interior of dorsal valve. X 1%. 21st Bridge. 2. Interior of ventral valve. X 1%. Same locality. 3. Exterior of dorsal valve. X 1%. Same locality. 4. Portion of the same enlarged, showing the bifurcating striae and the radiating thread-like ones. X 5. 5. Partly exfoliated interior of dorsal valve. X 2. 21st Bridge. 6. Interior of ventral valve, showing rounded median ridge. X 1%. Same locality. Romney formation, Hamilton member. Figs. 7-9. Chonetes Rugosus Kindle 158 7. Exfoliated ventral valve, showing imperfectly the subtended proc esses of the mucronate spines. X 2. 8. Type, showing a ventral valve with the peculiar spines attached latterly to the hinge line. X 2. 9. Natural mold of the exterior of a ventral valve. X 2. Romney formation, Onondaga member, 3 miles east of Cumberland. (After Kindle.) Figs. 10-13. Anoplea Nucleata 159 10,11. Casts of two ventral valves, showing two types of medium septum, one terminating anteriorly in an indistinct Y-shaped process. X 3. 12. Cardinal view of natural cast of pedicle valve, showing filling of oblique cardinal tubes. X 5. 13. Pedicle view. Romney formation, Onondaga member, Mendota, ...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236595319
  • 9781236595317