The Tertiary is a term for a geologic period 65 million to 1.8 million years ago. The Tertiary covered the time span between the superseded Secondary period and an out-of-date definition of the Quaternary period. The period began with the demise of the non-avian dinosaurs in the Cretaceous–Tertiary extinction event, at start of the Cenozoic era, spanning to beginning of the most recent Ice Age, at the end of the Pliocene epoch. The Cenozoic Era is divided into two periods, the Paleogene and Neogene, and they are in turn divided into epochs. The Paleogene consists of the Paleocene, Eocene, and Oligocene epochs, and the Neogene consists of the Miocene, Pliocene, Pleistocene, and Holocene epochs, the last of which is ongoing. Historically, the Cenozoic has been divided into periods (or sub-eras) named the Tertiary (Paleocene through Pliocene) and Quaternary (Pleistocene and Holocene).
The layers which can be found here are from the following series:
• Pleistocene (1,806 million to 11700 ago)
• Pliocene (5.332 million to 1,806 million years ago)
• Miocene (23.03 million to 5.332 million years ago)
• Oligocene (33.9 million to 23.03 million years)
The tertiary layers where sedimented in the “Mainzer Becken”. It‘s a subsidence zone with the borders at the “Rheinische Schiefergebirge” in the north, the “Oberrheingraben” in the east, Haardt and “Nahe-Bergland” in the west and Bad Dürkheim in the southpoint.
During tertiary several thrusts of the sea happened into the “Mainzer Becken”, same during the storage period of the lower ceriths-layer. The marine thrusts where only short-lived so the water recausticizing relatively rapid and a numerous amount of fossils arised in the brakish and freshwater of the different layers.
To log your find please answer me the following (by email):
a) In which of the layers are the distinctive bed of mussels?
b) In which of the layers are the alga structures?
If possible please attach a picture of you, you’re GPS taken with one of the information signs in the background to proof you visited the site.
You can log immediately your visit online after having sent the answers. It is not necessary to wait for my confirmation as I'll contact you in case there are errors in your answers. Should you log without sending me an answer I'll have to delete your log..
|