Cambrian–Ordovician Boundary beds at Tônismägi, Tallinn, North Estonia
- 1 July 1988
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 125 (4) , 457-463
- https://doi.org/10.1017/s001675680001308x
Abstract
The Cambrian–Ordovician Boundary beds at the Tônismägi section in Tallinn, North Estonia, are represented by siltstones and sandstones with interlayers of clay and kerogenous argillites. In this section, three conodont zones – Cordylodus proavus, C. intermedius and C. rotundatus-angulatus – were established. Graptolites of the Rhabdinopora flabelliforme group were found in the upper part of the C. proavus Zone. This section demonstrates that in suitable facies, species of Rhabdinopora may appear earlier than usually considered.Keywords
This publication has 2 references indexed in Scilit:
- Lower Ordovician conodonts from Washington Land, western North GreenlandBulletin of the Geological Society of Denmark, 1985
- The Tremadocian Beds at Flagabro in South-Eastern Scania (Sweden)Geologiska Föreningen i Stockholm Förhandlingar, 1958