A typical washing from the weathered Lower Devonian Limestone
(line drawing by V. Petr)
A typical washing from the weathered Lower Devonian Limestone
(line drawing by V. Petr)
The picture shows a washing from the so-called "white beds" showing typical
microfossil content of the Lodenice Limestone (Lower Devonian, Pragian),
"Cerveny lom" quarry near Praha-Klukovice, Barrandian area (Czech Republic). We
can see weathered (and generally damaged) remains of dacryoconarids (1),
orthothecids (2), gastropods (3), and brachiopods (4), while the skeletal
ossicles of echinoderms (5-25) are abundant and really well-preserved (including
the original stereom!), particularly crinoid cups and cup plates (5-11) as of
the genera Eohalysiocrinus (5), Pygmaeocrinus (6),
Gemmacrinus (7-9), Elicrinus (10), Lecanocrinus (11),
remains of crinoid arm plates (12-15), plates from the thecae of other
echinoderms as cyclocystoids (16), asteroids (17) and rhombiferans (18-19), and,
of course, numerous crinoid columnals (20-25), some of them very typical as of
the genera Myelodactylus (20) or Ammonicrinus (21).
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