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.
Re: Fossils B/C
Posted: April 6th, 2019, 12:08 pm
by dxu46
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=6I 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
Re: Fossils B/C
Posted: April 6th, 2019, 1:46 pm
by wec01
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=6I 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
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=6I 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.
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=6I 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.
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=6I 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
dxu46 wrote:
http://core.ecu.edu/geology/harper/Sedi ... w.cfm?ID=6I 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.
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=6I 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
I always thought that coquina was classified as organic clastic instead of biochemical
Re: Fossils B/C
Posted: April 13th, 2019, 1:42 pm
by RockRoll92
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?