university of south alabama · 2017. 2. 27. · introducing… the foraminifera pelagic . benthic ....
TRANSCRIPT
GY 112L: Earth History Lab
Week 6: Biostratigraphy
Instructor: Dr. Douglas W. Haywick
UNIVERSITY OF SOUTH ALABAMA
Today’s Agenda
1) Foraminifera 2) Biostratigraphy
Biostratigraphy
Low
er P
lioce
ne
Upp
er M
ioce
ne
Mid
-Mio
cene
10 MA
5 MA
7.5 MA
5 m
illio
n ye
ars
How to use fossils to tell time Consider trilobites, which lived during the Paleozoic era
Source: http://www.ideofact.com/archives/trilobite.jpg
Middle Silurian
Early
Silurian
Late Ordovician
Late
Silurian
How to use fossils to tell time
Source: http://www.ideofact.com/archives/trilobite.jpg
Species A
Species A (Late Ordovician to Earliest Silurian)
Middle Silurian
Early
Silurian
Late Ordovician
Late
Silurian
How to use fossils to tell time
Source: http://www.ideofact.com/archives/trilobite.jpg
Species A
Species B
Species B (Early Silurian to Middle Silurian)
Middle Silurian
Early
Silurian
Late Ordovician
Late
Silurian
How to use fossils to tell time
Source: http://www.ideofact.com/archives/trilobite.jpg
Species A
Species B
Species B (Early Silurian to Middle Silurian; a good index fossil if it’s cosmopolitan)
Species B LAD
Species B Biozone
Species B FAD
Middle Silurian
Early
Silurian
Late Ordovician
Late
Silurian
How to use fossils to tell time
Source: http://www.ideofact.com/archives/trilobite.jpg
Species A
Species B
Species C
Species C (Early Silurian to Late Silurian)
Middle Silurian
Early
Silurian
Late Ordovician
Late
Silurian
How to use fossils to tell time
Source: http://www.ideofact.com/archives/trilobite.jpg
Species A
Species B
Species C Middle Silurian
Early
Silurian
Late Ordovician
Late
Silurian
The age of the interval shown in blue can be relatively well constrained. It is the only time all 3 beasties were alive at the same time – sometime during the Early Silurian
Fossils & Biostratigraphy
Introducing… the foraminifera
Pelagic Benthic
0.25 mm
Fossils & Biostratigraphy
One group of foraminifera from one small interval of the Tertiary Period
Fossils & Biostratigraphy
This week’s lab
Fossils & Biostratigraphy
This week’s lab
Fossils & Biostratigraphy
This week’s lab
Fossils & Biostratigraphy
This week’s lab
Fossils & Biostratigraphy
This week’s lab
Fossils & Biostratigraphy
This week’s lab
Fossils & Biostratigraphy
L Eocene
Today’s Lab 1) Look at forams with a microscope.
2) Lot’s knit-picky work
Next Time Lab 7: Paleozoic Part 1 (last lab before exam 2)
GY 112/112L: Earth History
Lecture 13: Fossils Preservation
Instructor: Dr. Doug Haywick [email protected]
This is a free open access lecture, but not for commercial purposes. For personal use only.