Explorations and field-work of the Smithsonian Institution in .. . Fig. 10.—Hamilton fossils from Ontario and Michigan. 5, 7, 12, 13, and 16,crinoids, Michigan; 10, 11, 14, 15, Eleittherocrimis, a rare blastoid, X 2, Ontario;I, 2, 8, 9, brachiopods, Michigan; 6, peculiar snail, Ontario; 3 and 4, trilobite, X 2,Michigan. SMITHSONIAN EXPLORATIONS, I934 IS. Fig. II.—Hamilton fossil from Michigan. Head of shows upper surface, 2 lower surface. l6 SMITHSONIAN INSTITUTION the vicinity of East Bethany, not far southeast of Batavia. Thesebeds serve as a sure tie between the two region
Explorations and field-work of the Smithsonian Institution in .. . Fig. 10.—Hamilton fossils from Ontario and Michigan. 5, 7, 12, 13, and 16,crinoids, Michigan; 10, 11, 14, 15, Eleittherocrimis, a rare blastoid, X 2, Ontario;I, 2, 8, 9, brachiopods, Michigan; 6, peculiar snail, Ontario; 3 and 4, trilobite, X 2,Michigan. SMITHSONIAN EXPLORATIONS, I934 IS. Fig. II.—Hamilton fossil from Michigan. Head of shows upper surface, 2 lower surface. l6 SMITHSONIAN INSTITUTION the vicinity of East Bethany, not far southeast of Batavia. Thesebeds serve as a sure tie between the two regions. In Michigan the proportion of hmestone to shale greatly increasesover that in Ontario. Despite this lateral shift of lithology it is possi-ble to recognize the coral bed of Ontario in the Michigan the bed is considerably thicker than in Ontario, and there is agreater predominance of colonial corals over solitary corals. How-ever, the same coral types occur in both regions together with pecu-liar kinds of other fossils characteristic of the coral l)ed in Ontarioand Michigan. By means of this correlation it was determined thatthe Michigan section is approximately equivalent to the two middleformations of the New York middle Devonian (Hamilton) group ofrocks. On the basis of observations made during the summer it is possibletentati
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912
