Micro Fossils
-
Upload
alexis-wagner -
Category
Documents
-
view
223 -
download
0
Transcript of Micro Fossils
![Page 1: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/1.jpg)
MicropaleontologyEarth History 1131
![Page 2: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/2.jpg)
MicrofossilsNot necessarily microscopic, but details of a microfossil typically cannot be seen with the naked eyeMany make good index fossils
![Page 3: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/3.jpg)
Common microfossilsForamsRadiolariansDiatoms Conodonts
![Page 4: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/4.jpg)
Common microfossilsProtists
Eukaryotic, single-celled organismsContain forams, radiolarians (pictured below) and diatoms
![Page 5: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/5.jpg)
Common microfossilsForaminifera:
Single-celled, small organisms that either secrete a shell or construct an agglutinated shell.Can be planktonic or benthicFusulinids (pictured below) are common in the fossil record, and very useful for biostratigraphy
![Page 6: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/6.jpg)
Common microfossilsRadiolarians: marine zooplankton
Silica-based testFeed through trapping of food particles
![Page 7: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/7.jpg)
Common microfossilsDiatoms: photosynthetic algae
Silica test
![Page 8: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/8.jpg)
Common microfossilsConodonts: less understood than other microfossils, but very useful for biostratigraphy
Jaw portions (hard parts) are preserved in the fossil recordThermal Alteration Index
![Page 9: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/9.jpg)
Viewing microfossilsThe “big” picture
What can the fossils within a rock specimen tell us about the depositional environment?
Factors include:Rock compositionBathymetryOther influences (biological, chemical, etc.)
![Page 10: Micro Fossils](https://reader035.fdocuments.us/reader035/viewer/2022062311/577ccd281a28ab9e788ba70f/html5/thumbnails/10.jpg)
Viewing microfossils“Loose specimens”
Can be observed with a hand lens or basic microscope
“Specimens in matrix (rock)”Often viewed in a thin section of a rock (pictured below)