Author Affiliation, Ana.
Geography and Geology; Faculty of Pure and Applied Sciences
Evolution of the Jamaican echinoid fauna during the Eocene-Oligocene extinction crisis
Jamaican Journal of Science and Technology
Date of Publication
The change from the Caribbean Paleocene(?)/Eocene to the 'modern' (Oligocene to Recent) echinoid evolutionary fauna was determined by the pattern of extinction that occurred during the late Eocene and early Oligocene. This transition is now well-understood from the Jamaican rock record, where regional patterns were modified by local environmental changes. The transition from Yellow to White Limestone deposition in the middle Eocene reduced the range of sedimentary facies in Jamaica, with an associated decline in species diversity that persisted until after the late Oligocene. Eocene White Limestone echinoid faunas were apparently numerically dominated by oligopygoids (shelf edge) and clypeasteroids (lagoon and deeper water shelf); however, these groups have a high preservation potential, so their common occurrence may be a taphonomic artifact. Clypeaster is common in late Oligocene, White Limestone shelf edge faunas, a migrant that replaced the extinct oligopygoids. Similarities between this and coeval faunas from elsewhere in the region are moderately good. Since the late Oligocene, the Caribbean echinoid fauna has been composed mainly of taxa and are still extant in the region.....