Fossils B/C

[dchen22]

ROCKS AND MINERALS <3 (Click to Show Hidden Text)

1. A - shale/mudstone B - coquina C - I think oolitic limestone but it't not clear whether those bumps are oolites or just crystals
2. A and B
3. A is comprised of layers, while C is more like individual grains
4. Calcite/CaCO3 (shells)
5. Sorting is the distribution of grain sizes. B

Your turn!

Corrections (Click to Show Hidden Text)

1. C is siltstone
2. A and C are clastic
3. Yup, the terminology is A is varved/fissile

Wait (Click to Show Hidden Text)

but I thought coquina was clastic because it's composed of shells as clasts

I’m pretty sure that clastic rocks aren’t composed of organic materials (shells, tests, etc.) This is contrasted with organic/biochemical sedimentary rocks.

[dxu46]

Your turn!

Corrections (Click to Show Hidden Text)

1. C is siltstone
2. A and C are clastic
3. Yup, the terminology is A is varved/fissile

Wait (Click to Show Hidden Text)

but I thought coquina was clastic because it's composed of shells as clasts

I’m pretty sure that clastic rocks aren’t composed of organic materials (shells, tests, etc.) This is contrasted with organic/biochemical sedimentary rocks.

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

Question (Click to Show Hidden Text)

Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras

[wec01]

Wait (Click to Show Hidden Text)

but I thought coquina was clastic because it's composed of shells as clasts

I’m pretty sure that clastic rocks aren’t composed of organic materials (shells, tests, etc.) This is contrasted with organic/biochemical sedimentary rocks.

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

Question (Click to Show Hidden Text)

Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras

Answer (Click to Show Hidden Text)

Astraeospongia, Platyceras, Mucrospirifer, Archimedes, Exogyra

[dchen22]

Wait (Click to Show Hidden Text)

but I thought coquina was clastic because it's composed of shells as clasts

I’m pretty sure that clastic rocks aren’t composed of organic materials (shells, tests, etc.) This is contrasted with organic/biochemical sedimentary rocks.

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

The clasts have to be of preexisting nonbiochemical rocks. https://geomaps.wr.usgs.gov/parks/rxmin/rock2.html

[dxu46]

I’m pretty sure that clastic rocks aren’t composed of organic materials (shells, tests, etc.) This is contrasted with organic/biochemical sedimentary rocks.

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

The clasts have to be of preexisting nonbiochemical rocks. https://geomaps.wr.usgs.gov/parks/rxmin/rock2.html

Alright, thanks for the information! (my life in rocks and minerals was a lie adsahdlsadlk)

I’m pretty sure that clastic rocks aren’t composed of organic materials (shells, tests, etc.) This is contrasted with organic/biochemical sedimentary rocks.

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

Question (Click to Show Hidden Text)

Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras

Answer (Click to Show Hidden Text)

Astraeospongia, Platyceras, Mucrospirifer, Archimedes, Exogyra

Correct, your turn.

[wec01]

List the five major mass extinctions in chronological order and give a possible cause for each one.

[hmmm]

List the five major mass extinctions in chronological order and give a possible cause for each one.

Answers (Click to Show Hidden Text)

1.Ordovician-Silurian,glaciation
2.Late Devonian,bolide impact
3.Permian-Triassic,Siberian Traps
4.Triassic-Jurassic,climate change
5.Cretaceous-Paleogene,bolide impact

[wec01]

List the five major mass extinctions in chronological order and give a possible cause for each one.

Answers (Click to Show Hidden Text)

1.Ordovician-Silurian,glaciation
2.Late Devonian,bolide impact
3.Permian-Triassic,Siberian Traps
4.Triassic-Jurassic,climate change
5.Cretaceous-Paleogene,bolide impact

yep, your turn

[ScottMaurer19]

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

The clasts have to be of preexisting nonbiochemical rocks. https://geomaps.wr.usgs.gov/parks/rxmin/rock2.html

Alright, thanks for the information! (my life in rocks and minerals was a lie adsahdlsadlk)

http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6 I think the fact that it's made of clasts makes it clastic, even though it is biochemical. Limestone isn't clastic, and coquina is a form of limestone but it's still made of shells. That's my unprofessional opinion.

Question (Click to Show Hidden Text)

Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras

Answer (Click to Show Hidden Text)

Astraeospongia, Platyceras, Mucrospirifer, Archimedes, Exogyra

Correct, your turn.

I always thought that coquina was classified as organic clastic instead of biochemical

[RockRoll92]

I'm just going to revive this thread by posting a question.

Questions (Click to Show Hidden Text)

[img]http://i65.tinypic.com/2cgn87t.jpg[/img] 
1.) Identify this specimen 
2.) Why is it in this position? 
3.) What is it's class?
4.) Which lagerstätten is this class associated with?
5.) What is the name of this class referring to?
6.) Did this class have gills? If so where were they located?