Chaisson, William P (2003): (Table 1) First and last occurrences of the menardellid clade in sediments of ODP Site 154-925 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712436
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Abstract:
Biostratigraphic and isotopic studies of planktic foraminifera suggest that early to middle Pliocene closure of the Central American Seaway caused vicariant speciation among previously cosmopolitan menardellid foraminifera. New morphospecies were restricted to the tropical Atlantic. Isotopic data suggest that newly evolved Atlantic menardellids were adapted to more oligotrophic conditions, living higher in the water column than ancestral forms and perhaps harboring photosymbionts. In the late Pliocene, all but one menardellid morphospecies became extinct. These extinctions coincided with a progressive increase in the amplitude of periodic climatic change and the end of isolated tropical Atlantic surface circulation as Northern Hemisphere glaciation intensified.
Related to:
Chaisson, William P (2003): Vicarious living: Pliocene menardellids between an isthmus and an ice sheet. Geology, 31(12), 1085-1088, https://doi.org/10.1130/G19834.1
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 4.204233 * Longitude: -43.489067
Date/Time Start: 1994-02-08T00:00:00 * Date/Time End: 1994-02-14T00:00:00
Minimum Elevation: -3052.4 m * Maximum Elevation: -3052.4 m
Event(s):
154-925 * Latitude: 4.204233 * Longitude: -43.489067 * Date/Time Start: 1994-02-08T00:00:00 * Date/Time End: 1994-02-14T00:00:00 * Elevation: -3052.4 m * Penetration: 2017 m * Recovery: 1607.6 m * Location: South Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 184 cores; 1729.6 m cored; 0 m drilled; 92.9% recovery
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
11 data points
Data
| 1 Age [ka BP] | 2 FO | 3 LO |
|---|---|---|
| 2100 | Menardella exilis, finely perforate | |
| 2300 | Menardella pertenuis, finely perforate | |
| 2400 | Menardella limbata, normally perforate | |
| 2400 | Menardella miocenica, finely perforate | |
| 3100 | Menardella multicamerata, normally perforate | |
| 3500 | Menardella pertenuis, finely perforate | |
| 3800 | Menardella miocenica, finely perforate | |
| 4500 | Menardella exilis, finely perforate | |
| 6200 | Menardella multicamerata, normally perforate | |
| 10600 | Menardella limbata, normally perforate | |
| 12500 | Menardella menardii, normally perforate |