GSSP for Přídolí Series


The base of the Přídolí Series is defined within Bed 96 in the Požáry Section of the Daleje Valley, Prague, Czech Republic, where it coincides with the first occurrence of the graptolite species Neocolonograptus parultimus.


The Požáry Section is located on the southern slope of the Daleje Valley, about 1.5km east of Reporyje near the south-western boundary of Prague, in an abandoned railway cut at the entrance to the Požáry Quarries.
GSSP for Přídolí Series


The section is characterized by monoclinal south-westerly dipping rocks. The "cephalopod bank" of coarse biodetrital limestone with common cepahalopods is developed at the top of the underlying Kopanina Formation. The base of the Požáry Formation is characterized mostly by unsorted, bioclast-supported and micrite-supported biodetrital and biomicritic limestones with some intercalations of calcareous shale, and sorted clast-supported biodetrital limestone. Higher, above the base of the Přídolí Series, the sequence is formed of platy limestones with intercalations of calcareous shale.

Primary Markers:

First occurrence of the graptolite species Neocolonograptus parultimus within Bed 96.

Secondary Markers:

The last occurrence of Ozarkodina crispa is just below the Ludlow-Přídolí Boundary.
The first occurrence of Urnochitina gr. urna is just above the Ludlow-Přídolí boundary in Bed 97 of the Požáry Section.

Correlation Events:

Graptolite FAD Neocolonograptus parultimus

Notes on Derivation of Age:

Silurian and Ordovician time scales are from calibrating a CONOP composite graptolite zonation to selected radiometric ages

Additional Comments:

The name of Monograptus parultimus was changed to Neocolonograptus parultimus


Holland, C. H., 1985. Series and Stages of the Silurian System. Episodes 8/2, p. 101-103.

Kríz, J., 1989. The Přídolí Series in the Prague Basin (Barrandium area, Bohemia). In: Holland, C. H. and Bassett, M. G. (eds.). A global standard for the Silurian System. National Museum of Wales, Geological Series 9, p. 90 - 100, Cardiff.

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