Fossils B/C

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Re: Fossils B/C

Post by dchen22 » April 6th, 2019, 11:40 am

dxu46 wrote:
dchen22 wrote:
dxu46 wrote:
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!
1. C is siltstone
2. A and C are clastic
3. Yup, the terminology is A is varved/fissile
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.
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Re: Fossils B/C

Post by dxu46 » April 6th, 2019, 12:08 pm

dchen22 wrote:
dxu46 wrote:
dchen22 wrote: Your turn!
1. C is siltstone
2. A and C are clastic
3. Yup, the terminology is A is varved/fissile
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.
Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras

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Re: Fossils B/C

Post by wec01 » April 6th, 2019, 1:46 pm

dxu46 wrote:
dchen22 wrote:
dxu46 wrote:
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.
Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras
Astraeospongia, Platyceras, Mucrospirifer, Archimedes, Exogyra
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Re: Fossils B/C

Post by dchen22 » April 6th, 2019, 3:34 pm

dxu46 wrote:
dchen22 wrote:
dxu46 wrote:
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
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Re: Fossils B/C

Post by dxu46 » April 6th, 2019, 4:16 pm

dchen22 wrote:
dxu46 wrote:
dchen22 wrote: 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)
wec01 wrote:
dxu46 wrote:
dchen22 wrote: 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.
Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras
Astraeospongia, Platyceras, Mucrospirifer, Archimedes, Exogyra
Correct, your turn.

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Re: Fossils B/C

Post by wec01 » April 6th, 2019, 6:09 pm

List the five major mass extinctions in chronological order and give a possible cause for each one.
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Re: Fossils B/C

Post by hmmm » April 6th, 2019, 7:27 pm

wec01 wrote:List the five major mass extinctions in chronological order and give a possible cause for each one.
1.Ordovician-Silurian,glaciation
2.Late Devonian,bolide impact
3.Permian-Triassic,Siberian Traps
4.Triassic-Jurassic,climate change
5.Cretaceous-Paleogene,bolide impact
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Re: Fossils B/C

Post by wec01 » April 7th, 2019, 8:38 am

hmmm wrote:
wec01 wrote:List the five major mass extinctions in chronological order and give a possible cause for each one.
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
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Re: Fossils B/C

Post by ScottMaurer19 » April 8th, 2019, 4:27 am

dxu46 wrote:
dchen22 wrote:
dxu46 wrote: 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)
wec01 wrote:
dxu46 wrote: 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.
Order the following invertebrates from oldest to youngest (in numerical order right now): Astraespongia, Archimedes, Mucrospirifer, Exogyra, Platyceras
Astraeospongia, Platyceras, Mucrospirifer, Archimedes, Exogyra
Correct, your turn.
I always thought that coquina was classified as organic clastic instead of biochemical
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Re: Fossils B/C

Post by RockRoll92 » April 13th, 2019, 1:42 pm

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