About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 50 (1966)

Issue: 3. (March)

First Page: 641

Last Page: 641

Title: Conodont Zones and Stratigraphic Variability in Upper Devonian of Ontario: ABSTRACT

Author(s): C. Gordon Winder

Article Type: Meeting abstract

Abstract:

A 259-foot section of the Upper Devonian Kettle Point Formation in a cable-tool-drilled well is almost a complete section of the formation. Species of platform-facies conodonts occur in a sequence which correlate with zones defined by Ziegler (1958, 1962) and indicate that almost the entire Upper Devonian is present. Certain zones can not be recognized because the specimen yield is too low; correlation with the standard Upper Devonian ammonoid zones is cited.

The rock is black shale, but the section can be divided into four parts on the basis of the presence or absence of gray silty shale. The stratigraphic distribution of mineralogical and paleontological entities is noted and the following seem to have a common association: (1) black shale, pyritized sponge spicules, Tasmanites Newton 1875, and pyritized Radiolaria; and (2) black and gray shale, euhedral pyrite, and abundant conodonts; worm burrows, Lingula Bruguiere 1797, and fish scales occur in the lower sequence of gray beds but not in the upper.

The sequence is interpreted as representing deposition in a basin with gradually increasing water depth. The stratigraphic variation of the conodonts and their apparent inverse relation with Radiolaria suggest that the conodont-bearing animals lived in the shelf areas of the sea. Conclusions based on a single drill hole are tentative.

End_of_Article - Last_Page 641------------

Copyright 1997 American Association of Petroleum Geologists