Middle Ordovician to Early Silurian terranes of the northern Casco Bay region, Maine
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The Gander Conference, an International Conference on Stratigraphy and Structure Bearing on the Origin of the North Atlantic Ocean, was held in Gander, Newfoundland, August 1967. The conference gave geologists familiar with the areas bordering the North Atlantic Ocean with an opportunity to present their knowledge and ideas to colleagues dealing with similar rocks and structures. This publication contains most of the papers that were presented at that conference and a few others that were prepared for the sessions.
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ABSTRACT Only brief mention of Ordovician and Silurian fossils from Somerset and Prince of Wales islands has been made in past geological reports. A more comprehensive list of fossils collected from the two lowermost Paleozoic formations (the Lang River and Allen Bay) is presented. Three distinct faunal groups are present in these two formations, a Lower Ordovician, an Upper Ordovician (arctic Ordovician) and a Silurian fauna. The rich and diverse arctic Ordovician fauna is comparable to the Stony Mountain fauna of Manitoba. The Silurian fossils are probably Niagaran in age (Middle Silurian).
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Over 1,000 m of Upper Ordovician to Lower Silurian mixed carbonate and clastic strata on Anticosti Island are nearly tectonically undisturbed, despite their proximity to the Northern Appalachians fronting Quebec's Gulf of St. Lawrence. Natural cliffs exposed along the coast and rivers in the eastern part of the island make a relatively conformable sequence belonging to the Ashgill and Llandovery Series. Fossil communities interpreted as depth-associated in life are especially repetitious in the Becscie, Gun River, Jupiter, and Chicotte Formations (Llandovery Series), and to a lesser degree in the Upper Vaureal and Ellis Bay Formations (Ashgill Series). Preliminary study of the pattern of changeovers in Eocoelia, Pentamerus and Stricklandia communities suggests that Anticosti seas deepened and shallowed three and a half times during the Early Silurian. High water peaks were reached during B1-B2, C1-C2 and C4-C5 times, with a final deepening trend beginning in late C5 time. Age determinations of these events are based on the occurrence of graptolites (with some new records from Anticosti) keyed to the standard graptolite zones, and species of the Eocoelia lineage are also useful for correlation. The profile of the Anticosti sea-level curve compares well with other curves reconstructed from the Lower Silurian of New York, Michigan, and Iowa. Widespread synchronism in sea-level changes on the North American platform is thus corroborated.
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