The Sylen and Solovjeva Shoals as Observed by a Diving Geologist

Winterhalter, Boris

doi:10.1080/11035896709448365

Cited by 2 publications

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“…Interestingly, some mound-like structures have been recorded also in the Ordovician succession in the Bothnian Sea (Axberg 1980). One of these has been dated to be of Keilan age (Winterhalter 1967) and it appears to be coeval 290 Bergström et al: The stratigraphy of the Upper Ordovician carbonate mounds in Gotland GFF 126 (2004) with the Kullsberg mounds in Dalarna but slightly older than the typical Östersjö Limestone. For easy reference it is convenient to distinguish these stratigraphically different mound generations by separate stratigraphic terms as has long been done in Dalarna.…”

Section: Stratigraphic Terminologymentioning

confidence: 96%

The stratigraphy of the Upper Ordovician carbonate mounds in the subsurface of Gotland

Bergström¹,

Löfgren²,

Grahn³

2004

GFF

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In a revision of the stratigraphic classification of the subsurface Upper Ordovician succession of Gotland, the terms Lower and Upper Östersjö Limestone are rejected and replaced by the Slandrom Limestone and the File Limestone, respectively. Two mound generations are recognized, the RakveranNabalan Liste mounds and the Pirguan Klasen mounds, the latter being by far the most common. Both occur not only in the Gotland subsurface but also in submarine areas off Gotland. Moderately diverse conodont collections retrieved from core samples in and around carbonate mounds provide the first direct biostratigraphic dates of these structures. Samples from the Liste mounds contain species of the Amorphognathus superbus Zone. Besides the zonal index and numerous specimens of Panderodus, there are representatives of Amorphognathus complicatus Rhodes, Belodina confluens Sweet, Decoriconus costulatus (Rexroad), Protopanderodus liripipus Kennedy, Barnes & Uyeno, Pseudooneotodus mitratus (Moskalenko), Dapsilodus sp., Besselodus? sp. and a few other taxa. The Klasen mounds have not yet produced biostratigraphically diagnostic conodonts but comparison with non-mound successions indicate that they belong to the A. ordovicicus Zone. Their biostratigraphic age suggests that the Liste mounds may be slightly younger than the Kullsberg mounds, and the Klasen mounds equivalent to the Boda mounds, in the Siljan district.

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Section: Stratigraphic Terminologymentioning

confidence: 96%