ISOLATED GRAPTOLITES FROM THE TELYCHIAN (UPPER LLANDOVERY, SILURIAN) OF LATVIA AND ESTONIA |
| |
| Authors: | DAVID K. LOYDELL, VIIU NESTOR&dagger |
| |
| Affiliation: | School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK;e-mail:; Institute of Geology at Tallinn University of Technology, 7 Estonia Avenue, 10143 Tallinn, Estonia;e-mail: |
| |
| Abstract: | Abstract: Isolated material of 21 graptolite species from the upper Telychian of Latvia and Estonia is described. New thecal structures are recognized in Streptograptus , for example enrolment of the disto-lateral margin of the flange in distal S. nodifer thecae, possession of proximal lobes in S. wimani and elongated proximal lobes in S. sp. 3. S. spp. 1 and 2 both possess a nozzle, but do not have coiled metathecae. Thecal asymmetry in Oktavites falx is shown to be the reverse of that in O. spiralis . Several new Streptograptus and Monoclimacis species remain to be described. The absence of many of the taxa described herein from Silurian equatorial regions strengthens the case for a distinct equatorial graptolite province. |
| |
| Keywords: | Silurian Llandovery Telychian graptolite palaeobiogeography Estonia Latvia |
|
|
