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CSPG Special Publications

Abstract


Intl. Symposium of the Devonian system: Papers, Volume II, 1967
Pages 711-719
Biostratigraphy

Micropalaeontology of the Devonian in Ontario

C. G. Winder

Abstract

The lithology and average thickness of a general stratigraphic section in Ontario can be summarized as follows, in ascending order - the thin Oriskany Sandstone (10 feet) with limited local distribution; Bois Blanc Limestone (100 feet) with an abundance of chert and corals; the high purity Detroit River Limestone or Dolostone (300 feet); the argillaceous Dundee Limestone (150 feet) with a notable brachiopod fauna; alternating grey shales and limestones of the Hamilton Formation (270 feet) which is generally fossiliferous; and the black and greenish grey Kettle Point Shales (200 feet).

The Bois Blanc Formation has a sparse fauna of conodonts including Icriodus latericrescens bilatericrescens Ziegler which indicates an Emsian (Early Devonian) age. The Detroit River Group contains a fauna of scolecodonts including Arabellites Hinde, Protarabellites Stauffer, Lumbriconereites Ehlers and Nereidavus Ehlers; on the basis of two sections, the organisms are only abundant in the lower part.

Conodonts are abundant throughout the Dundee Limestone and its presumed lateral equivalent, the black Marcellus Shale, to the top of the Hamilton Formation. The conodont Polygnathus linguiformis Hinde suggests an Eifelian to Givetian age (Middle Devonian). Fifteen genera of scolecodonts have been identified in the Dundee. A diverse fauna of ostracodes occurs in all units of the Hamilton. The uppermost Ipperwash Limestone of the Hamilton contains the conodont Polygnathus varca Stauffer indicating a Late Middle Devonian (tmo) to earliest Late Devonian (toIα) age. The uppermost beds of the Ipperwash contain the arenaceous foraminifera Tolypammina Rhumbler.

A thin (2 mm) “conodont hash” at the base of the thin chert bed at the bottom of the Kettle Point contains Palmatolepis subperlobata Branson and Mehl which is not older than toIδ (Frasnian); a large part of the Manticoceras-Stuie must be missing at the Kettle Point type locality. The sequence of conodonts through the Kettle Point suggests that almost the entire Late Devonian (Frasnian and Famennian) is present; in addition to conodonts, the Kettle Point contains radiolaria, sponge spicules, arenaceous foraminifera, and scolecodonts.


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