Download Ammonite faunas and stratigraphy of Lower Cretaceous by JenFo Nagy PDF

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By JenFo Nagy

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1841 Ammonites Guersanti n. sp. - D'ORBIGNY, p. 235, pl, 67, figs. 1, 2, 4. cf. 1965 Otohoplites guersanti (D'ORBIGNY). - CASEY, p. 505, pl, LXXXVI, fig. 4; text-figs. 190a-c, 191 f-g. Material: - Three specimens preserved as internal molds with attached fragments of the shell wall. The specimens are crushed laterally. Description: - The whorls are higher than wide and have gently convex sides. The umbilicus is narrow, with low, subvertical wall and definite but rounded rim. The venter of the phragmocone is subtabulate, whereas the venter of the body chamber is rounded.

P. 35) Fig. 8-10. Grycia sablei (IMLAY) 8. Lateral view of A32833 from locality 24. 9. Lateral view of A32832 from locality 16. 10. Lateral view of A32831 from locality 24. (p. 37) Fig. 11. (p. 39) Grycia sp. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Lateral view of A32843 from locality 34. \ 10 11 PLATE 2 Fig. 1. Grycia sablei (IMLAv) Lateral view of A32834 from locality 21. (p. 37) Fig. 2-4. Grycia whittingtoni (IMLAV) 2. Lateral view of A32830 from locality 21.

Whorl sections and suture line of Gastroplites. a. Gastroplites sp. A. Section through body chamber ( x 1) of A32826 from locality 19. b-d. Gastroplites subquadratus n. sp. Holotype, A32827, from locality 20; b, section through body chamber (x 1); c, section through phragmocone (x 1); d, external suture (x 3) at a whorl height of 12 mm. Measurements: No. Diameter Whorl height Whorl width Umbilical diameter A32827 47 mm 37 » 22 mm 47% 17 » 46 ~ 22 mm 47% 17 » 46 » 10 mm 21% 9 » 24 » » Remarks: - Gastroplites is particularly well-known from Canada and Alaska, but it has been recorded also from East Greenland and England.

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