| Abstrakt: |
The early Pleistocene Manchioneal Formation of eastern Jamaica, generally interpreted as having been deposited in a deeper-water (± 100 m and greater), fore reef environment, includes a moderately diverse fauna of fossil echinoderms, particularly crinoids (in basal sections of this formation only, implying a shallowing-upward trend) and echinoids. While crinoids do not occur in the basal Middle Coral Rock in Barbados, an undescribed echinoderm fauna includes astropectinid sp. indet., Cidarjs (Tretocidaris) bartletti (A. Agassiz), Stylocidaris affinis (Philippi), Lytechinus sp. cf. L. variegatus (Lamarck), Echinolampas depressa? Gray and Clypeaster sp. This is the most diverse echinoderm assemblage known from Barbados. It is comparable with that of certain sections of the Manchioneal Formation, particularly that of the type section, and implies that they were deposited in a similar environmental setting. This deduction is supported by the evidence from sedimentology and other faunal elements, such as articulated brachiopods. [ABSTRACT FROM AUTHOR] |
