Fossils B/C

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Re: Fossils B/C

Post by hmmm » March 30th, 2019, 11:04 am

wec01 wrote:
hmmm wrote:oof, I can't read
1.What is the genus of the largest known trilobite?
2.Which ornithschian on the list is controversial and why?
3.Name 3 transition fossils on the list and between which two groups of animals they are(sorry for the bad wording)
1. Isotelus
2. Dracorex, some think they are simply young Pachycephalosaurus
3. Archaeopteryx (dinosaurs to birds), Tiktaalik (fish to tetrapods), Messohippus? (hyracotherium to modern horses)
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Re: Fossils B/C

Post by wec01 » March 30th, 2019, 12:36 pm

Which specimen from the list is each of the following most closely related to?:
1. Cryptolithus
2. Eryops
3. Basilosaurus
4. Echinoidea
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Re: Fossils B/C

Post by dchen22 » April 2nd, 2019, 7:03 pm

wec01 wrote:Which specimen from the list is each of the following most closely related to?:
1. Cryptolithus
2. Eryops
3. Basilosaurus
4. Echinoidea
Some of these have multiple answers. For example Echinoidea is equally closely related to Asteroidea and Ophiuroidea.
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Re: Fossils B/C

Post by wec01 » April 2nd, 2019, 7:18 pm

dchen22 wrote:
wec01 wrote:Which specimen from the list is each of the following most closely related to?:
1. Cryptolithus
2. Eryops
3. Basilosaurus
4. Echinoidea
Some of these have multiple answers. For example Echinoidea is equally closely related to Asteroidea and Ophiuroidea.
Some trees display it that way, but there are also some that show Asteroidea diverging earlier than Ophiuroidea with Echinoidea last, so I guess that one is somewhat open to debate. I think the others should be just one answer, but let me know if any of the others are like that.
2019 Division C Nationals Medals:
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5th place Sounds of Music
2nd place Thermodynamics

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Re: Fossils B/C

Post by dchen22 » April 4th, 2019, 6:43 pm

wec01 wrote:
dchen22 wrote:
wec01 wrote:Which specimen from the list is each of the following most closely related to?:
1. Cryptolithus
2. Eryops
3. Basilosaurus
4. Echinoidea
Some of these have multiple answers. For example Echinoidea is equally closely related to Asteroidea and Ophiuroidea.
Some trees display it that way, but there are also some that show Asteroidea diverging earlier than Ophiuroidea with Echinoidea last, so I guess that one is somewhat open to debate. I think the others should be just one answer, but let me know if any of the others are like that.
For number 1, Cryptolithus is most closely related to Isotelus but I can’t do any of the rest because I haven’t studied vertebrates. I’ll leave that to someone else.
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Re: Fossils B/C

Post by wec01 » April 4th, 2019, 7:06 pm

dchen22 wrote:
wec01 wrote:
dchen22 wrote:
Some of these have multiple answers. For example Echinoidea is equally closely related to Asteroidea and Ophiuroidea.
Some trees display it that way, but there are also some that show Asteroidea diverging earlier than Ophiuroidea with Echinoidea last, so I guess that one is somewhat open to debate. I think the others should be just one answer, but let me know if any of the others are like that.
For number 1, Cryptolithus is most closely related to Isotelus but I can’t do any of the rest because I haven’t studied vertebrates. I’ll leave that to someone else.
Yep, I'm just gonna list the other ones since no one else seems to be answering:
For Eryops it would be Acanthostega and for Basilosaurus it would be Mesohippus Your turn
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Re: Fossils B/C

Post by dchen22 » April 5th, 2019, 4:36 pm

A.[img]http://core.ecu.edu/geology/harper/Sedimentary/S19.gif[/img]
B.[img]https://www.naturepl.com/cache/pcache2/01448068.jpg[/img]
C.[img]https://farm9.staticflickr.com/8252/8513579676_3e4cd6a5a0_b.jpg[/img]
1. Identify specimens A, B, and C.
2. Which specimens are clastic?
3. What is the distinctive feature about specimen A compared to specimen C?
4. What mineral comprises specimen B?
5. What is sorting? Which one of the specimens is poorly sorted?
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Re: Fossils B/C

Post by dxu46 » April 5th, 2019, 7:21 pm

dchen22 wrote:
A.[img]http://core.ecu.edu/geology/harper/Sedimentary/S19.gif[/img]
B.[img]https://www.naturepl.com/cache/pcache2/01448068.jpg[/img]
C.[img]https://farm9.staticflickr.com/8252/8513579676_3e4cd6a5a0_b.jpg[/img]
1. Identify specimens A, B, and C.
2. Which specimens are clastic?
3. What is the distinctive feature about specimen A compared to specimen C?
4. What mineral comprises specimen B?
5. What is sorting? Which one of the specimens is poorly sorted?
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

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Re: Fossils B/C

Post by dchen22 » April 6th, 2019, 11:34 am

dxu46 wrote:
dchen22 wrote:
A.[img]http://core.ecu.edu/geology/harper/Sedimentary/S19.gif[/img]
B.[img]https://www.naturepl.com/cache/pcache2/01448068.jpg[/img]
C.[img]https://farm9.staticflickr.com/8252/8513579676_3e4cd6a5a0_b.jpg[/img]
1. Identify specimens A, B, and C.
2. Which specimens are clastic?
3. What is the distinctive feature about specimen A compared to specimen C?
4. What mineral comprises specimen B?
5. What is sorting? Which one of the specimens is poorly sorted?
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
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Re: Fossils B/C

Post by dxu46 » April 6th, 2019, 11:37 am

dchen22 wrote:
dxu46 wrote:
dchen22 wrote:
A.[img]http://core.ecu.edu/geology/harper/Sedimentary/S19.gif[/img]
B.[img]https://www.naturepl.com/cache/pcache2/01448068.jpg[/img]
C.[img]https://farm9.staticflickr.com/8252/8513579676_3e4cd6a5a0_b.jpg[/img]
1. Identify specimens A, B, and C.
2. Which specimens are clastic?
3. What is the distinctive feature about specimen A compared to specimen C?
4. What mineral comprises specimen B?
5. What is sorting? Which one of the specimens is poorly sorted?
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

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