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- W2325247091 abstract "Conodonts are minute teeth which the writer places with the Cyclostomata, the reason for this classification being that in the Cretaceous strata there occurs an undescribed genus intermediate in shape between a tooth of the modern Petromyzon (Cyclostomata) and certain Pennsylvanian conodonts. The cyclostomes migrate to continental waters for spawning purposes. Their strenuous activities during spawning cause them to become weakened and, death results.! The carcasses are deposited in lagoonal and other types of near shore deposits. These types of sediments form the geologic environments of conodonts.2 Since evidence at hand indicates that conodonts are ancestral cyclostomes, the abundance of these minute teeth in the sediments of the Paleozoic and Mesozoic eras suggests that large numbers of cyclostomes have existed in the geologic past. The teeth are the only hard parts of the cyclostomne, and compose less than one percent of the creatures' total weight. As each individual contains about 135 teeth, by counting the teeth in a given sample an estimate could be obtained of the abundance of pre-existing cyclostomes in the locality. In view of the general concept that petroleum is of organic origin the large amount of fat 'in these conodont-bearing animals, (if indeed they are related to the modern cyclostomes and of similar composition), would, because of their great number as indicated by the abundance of teeth, be a significant contribution of material suitable for conversion into petroleum.3 It is significant that some of the strata most abundant in conodonts are the supposed source beds of petroleum-such" @default.
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- W2325247091 date "1932-09-01" @default.
- W2325247091 modified "2023-09-26" @default.
- W2325247091 title "Conodonts in Relation to Petroleum" @default.
- W2325247091 doi "https://doi.org/10.2307/2420178" @default.
- W2325247091 hasPublicationYear "1932" @default.
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