The Monroe Formation of Southern Michigan And Adjoining Regions

Cover The Monroe Formation of Southern Michigan And Adjoining Regions
The Monroe Formation of Southern Michigan And Adjoining Regions
Grabau, Amadeus W. (Amadeus William), 1870-1946
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Indifferens Barrande from Div. F, 2, is very similar to our species, differing chiefly in the more pronounced sinus. (Barrande Syst. Sil. , Vol. V, pi. 3, figs. 5 a, c. ) Horizon and localities. This species is represented by only a few individuals in the coral layer (Anderdon) of the Monroe, in the Detroit salt shaft. It is associated with Diplophyllum and other fossils characteristic of this bed. It is also found common in the Amherstburg brown dolomite from the Detroit river bed, opposite Am...herstburg, Ont. , associated with the mutation depressus and is also, though more sparingly, represented in the Amherstburg bed of the Patrick quarry on Grosse Isle.
54. Mutation DEPRESSUS nov. (Plate XXI, Figs. 24-26, 31-33. ) This mutation differs from the typical form in having a more pronounced quadrangular outline, higher cardinal portion, more angular cardinal margins, smaller hinge area, a more pronounced median sinus, stronger plication and somewhat more widely sepa- rated dental plates.


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