Conodonts have been described from Jurassic rocks in Japan andfrom Upper Cretaceous rocks in western Africa. However, both occurrences might also be interpreted as reworked faunas. Arguments in favor of the reported ages include independent interpretation of the age of the enclosing rock and apparent lack of source rocks for reworking. Opposing arguments include well-established Triassic occurrences of conodonts that appear to be identical with most of the species reported as post-Triassic.
The occurrence of conodonts in the TriassicPeriod is now well documented. However, reports of their occurrence in rocks of post-Triassic age are restricted to an account by Diebel (1956) and a paper by Nohda and Setoguchi (1967). Previous discussions of one or both of these reports are found in Lindstrom (1964), Miiller (1966), and Mosher (1967). Diebel (1956) reported conodonts from Upper Cretaceous rock collected at the end of the last century by Dr. Esch in the Cameroons of western Africa. Determination of the Cretaceous (Turonian) age of the rock slabs was based on specimens of an ammonite (Benueites benueensis Reyment) found in them. When studied for conodonts, the slabs were housed in the Berlin Paleontological Museum. Due to the present political circumstances in western Africa, it has not been 467 on June 16, 2015 memoirs.gsapubs.org Downloaded from
Conodonts have been described from Jurassic rocks in Japan andfrom Upper Cretaceous rocks in western Africa. However, both occurrences might also be interpreted as reworked faunas. Arguments in favor of the reported ages include independent interpretation of the age of the enclosing rock and apparent lack of source rocks for reworking. Opposing arguments include well-established Triassic occurrences of conodonts that appear to be identical with most of the species reported as post-Triassic.
The occurrence of conodonts in the TriassicPeriod is now well documented. However, reports of their occurrence in rocks of post-Triassic age are restricted to an account by Diebel (1956) and a paper by Nohda and Setoguchi (1967). Previous discussions of one or both of these reports are found in Lindstrom (1964), Miiller (1966), and Mosher (1967). Diebel (1956) reported conodonts from Upper Cretaceous rock collected at the end of the last century by Dr. Esch in the Cameroons of western Africa. Determination of the Cretaceous (Turonian) age of the rock slabs was based on specimens of an ammonite (Benueites benueensis Reyment) found in them. When studied for conodonts, the slabs were housed in the Berlin Paleontological Museum. Due to the present political circumstances in western Africa, it has not been 467 on July 22, 2015 memoirs.gsapubs.org Downloaded from
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