Table of occurrences of the particular echinoderm classes in the Lower and Middle Devonian of the Barrandian area (originally after Prokop et Petr from Petr 1994, modified here). Brown solid colour denotes previous research discoveries, dashed areas mark new observations of more or less isolated skeletal elements in the so-called 'white beds' made by Rudolf Prokop and Prokop et Petr. Today, however, even this picture is slightly out of date (Rudolf Prokop has discovered ophiocistioid teeth of a new type in the Lochkovian)
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