Silurian Reefs of Gotland

Silurian Reefs of Gotland

Author:

Publisher: Elsevier

Published: 1971-01-01

Total Pages: 554

ISBN-13: 0080869246

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The Swedish island of Gotland, in the Baltic, has attracted much attention of many geologists. Gotland is built up by a Middle Palaeozoic table-land, with an average height of 20-30 m, but with some higher hills in the inland and with steep cliffs along part of the coast. The Middle Palaeozoic strata consist primarily of limestones and marlstones. For a good understanding of the sedimentary succession of Gotland, it is important that the distribution of all the different kinds of sediments should be carefully mapped, and their faunal contents to be intensively studied. This book includes the survey and ideas gathered along with important data about the stratigraphy and reefs of Gotland. It presents description of the Baltic area, development of the stratigraphical subdivision of the Middle Palaeozoic of Gotland, and some tectonic and pseudo-tectonic phenomena. Stratified and unstratified sediments are presented along with a number of palaeoecological observations on Gotlandian fossils. Some comparisons of the reefs of Gotland with reefs in a few other areas are also examined.


Excursion-guidebook

Excursion-guidebook

Author: International Symposium on Fossil Cnidaria (6, 1991, Münster, Westfalen)

Publisher:

Published: 1991

Total Pages: 111

ISBN-13:

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A New Silurian (Llandovery, Telychian) Sponge Assemblage from Gotland, Sweden

A New Silurian (Llandovery, Telychian) Sponge Assemblage from Gotland, Sweden

Author: Freek Rhebergen

Publisher: John Wiley & Sons

Published: 2014-02-27

Total Pages: 161

ISBN-13: 1118906640

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A newly discovered, diverse sponge fauna of early Silurian age, is described from Gotland, Sweden. This is the first Silurian sponge assemblage known from Baltica, and the only diverse Llandoverian assemblage known worldwide. The fauna includes 20 genera and 29 species, of which three genera and six species are new. Eighteen species are new to Baltica. The fauna shows strong similarities to later Silurian assemblages in Arctic Canada, but one endemic species comprises ca. 50% of the fauna. The fauna shows that lithistid sponges recovered well from the late Ordovician extinction in some areas, and became widely spread in the early Silurian. In contrast, non-lithistid sponges like, such as hexactinellids, appear to have evolved rapidly during the Late Ordovician – early Silurian interval, and some modern groups probably originated in inshore habitats.