Callovian and Oxfordian echinoids of Zalas
Keywords:
Echinods, Ecology, palaeoenvironment, Callovian, Oxfordian, PolandAbstract
Within the Callovian-to-Oxfordian sequence, transgressive upon the Variscan rhyodacite laccolith exposed at Zalas in the Cracow Upland, southern Poland, and far-known due to its ubiquitous fossils of various kinds, to this study subjected are the echinoids.The Callovian assemblage from the variably-sized clastics is low-diversified, to contain 4 taxa of a wid er regional occurrence. The Lower (up to the base of Middle) Oxfordian assemblage appears the richest in the Oxfordian of Poland. Its content is typified by the representatives of the order s Cidaroida Claus, 1880, and Phymosomatoida Mortensen, 1904. Amongst the recognised 12 species, of special attention are those first reported from the Jurassic sequences of Poland, viz. [i]Eosalenia miranda[/i] Lambert, 1905, and [i]Heterocidaris dumortieri[/i] Cotteau, 1871, the latter of which is still a great rarity to the science. Discussed are the life requirements of some of the recognised taxa, as apparent from the functional analysis of their tests.Downloads
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