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Morrowites : ウィキペディア英語版
Morrowites

''Morrowites'', named by Cobban and Hook, 1983, is a moderate to large-sized ammonite with quadrangular to depressed whorls, broadly rounded to depressed venter, low ribs, umbilical and inner and outer ventrolateral tubercles and smooth early whorls except for occasional ribs along weak constrictions. The suture is moderately simple and has an unusually broad bifid first lateral lobe. It is so far restricted to the Lower Turonian stage, in the mid Cretaceous.
''Morrowites'' closely resembles ''Mammites'', however ''Morrowites'' has a broad first lateral lobe, ''Mammites'' has a narrow one. The very early whorls of ''Morrowites'' are smooth except for distantly placed ribs and constrictions, those of ''Mammites'' have normal ribs and tubercles.
''Morrowites'' is named in honor of A. L. Morrow who made a pioneering study of Cenomanian and Turonian ammonites of Kansas.
==References==

* W. A. Cobban and Hook, S. C. 1983 Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico. Memoir 41, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.

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