Early Ludlow monograptids with Devonian morphological affinities
- 1 January 1977
- journal article
- research article
- Published by Scandinavian University Press / Universitetsforlaget AS in Lethaia
- Vol. 10 (1) , 59-70
- https://doi.org/10.1111/j.1502-3931.1977.tb00593.x
Abstract
Nilssoni-scanicus Zone deposits (Silurian, early Ludlow) from the Leintwardine and Long Mountain districts of Britain, and the Calarasi Borehole, Moesian Platform of Romania, have yielded a species of monograptid which, while resembling rare Ludlow Monoclimacis spp., has strong morphological affinities with Devonian monograptids such as Monograptus ramstalensis Jaeger. Because of the occurrence of such structures at a surprisingly low horizon caution is suggested in identifying age from monotypic assemblages. The difficulties surrounding the affinities of the low Ludlow species necessitates a provisional open nomenclature as Monograptus sp. The possible evolutionary significance is discussed.This publication has 1 reference indexed in Scilit:
- Rumanian graptolites from boreholes on the Moesian PlatformGeological Magazine, 1975