|
Planktic foraminifers across the Cretaceous/Tertiary K/T Boundary |
|
|
Planktic foraminifers across the Cretaceous/Tertiary K/T Boundary |
|
| SEM images of selected samples from ODP site 1262, Walvis Ridge, Southern Atlantic Ocean |
|
|
Enlargement of chamber wall of P eugubina with numerous micropores
|
|
Side view of P eugubina. Seems like most micropores are concentrated on the oputer periphery of the chamberwalls |
|
|
|
Side view of P eugubina. Seems like most micropores are concentrated on the oputer periphery of the chamberwalls |
|
Another Parvularugoglobigerina eugubina specimen from el Kef. This specimen, as with the vast majority of G eugubina specimens anywhere, shows complete overgrowth of the testwall by secondary calcite, masking the micropores. |
|
|
|
Parvularugoglobigerina eugubina specimen from el Kef. This specimen, as with the vast majority of G eugubina specimens anywhere, shows complete overgrowth of the testwall by secondary calcite, masking the micropores. |
|
Enlargement of the specimen shown above of the surface of the penultimate chamber. The test wall is smooth, where no secondary calcite overgrowth is present. On the smooth testwall scattered micropores are visible, that are different from those in all Cretaceous and most other lower Paleocene planktonic foraminifers. The difference besides size (these are much smaller) are the absence of any rim around the pores. |
|
|
|
El Kef, Tunisia |
|
Parvularugoglobigerina eugubina, (syn longiapertura) K/T + 50 cm well preserved specimen showing micropores in areas without secondary overgrowth |
|
|
|
Globotruncanella caravacaensis (smit 1975) Upper Maastrichtian Corsicana formation Brazos river 1 section, Texas |
