Fossils B/C

AwersomeUser
Member
Member
Posts: 116
Joined: December 8th, 2018, 5:20 am
Division: B

Re: Fossils B/C

Postby AwersomeUser » February 6th, 2019, 5:44 pm

Ok. Hi again. So trilobite has tons of species and stuff so do you think this is enough? Do I have list some order/family?

Trilobites range from the Cambrian to the Permian. Next to ostracodes they are the most common arthropod fossil. Trilobite means three-lobed and refers to the three longitudinal divisions of their calcified exoskeleton. An axial lobe running down the center is attached to pleural lobes on either side. The head or chephalon is separated from the tail or pygidium by thorasic segments. As juveniles, trilobites were pelagic, swimming in the plankton. As adults, most trilobites were benthic detritus feeders, although there are some exceptions such as the agnostids, which are thought to have lived a pelagic life due to their world-wide distribution. Trilobites were one of the first organisms to have eyes and may have been the first with eyes that focused images. Many trilobite species lost their eyes through selection such as the agnositds and Cryptolithus.

Trilobites have compound eyes made of calcite crystals. Two important types of compound eye can be found in trilobites. Holochroal eyes consisted of hundreds (up to 15,000) of closely packed elongated prisms of calcite arranged in a hexagonal pattern. The lenses of these eyes must be viewed with the aid of magnification. Holochroal eyes produced composite images of the world, but with little resolution. Phacops trilobites possessed schizochroal eyes. Schizochroal eyes are made of larger spherical-shaped lenses numbering in the hundreds (up to 700) and separated by exoskeleton. Each lens is made of two calcite crystals arranged as a doublet lens. Ironically, the doublet lens was designed by Dutch scientist Christian Huygens (1629-1695) and the French philosopher Rene Descartes (1586-1650) to correct for spherical aberration. Through selection nature had anticipated the same design 400 million years earlier. The phacopid lens produced larger images bringing them into sharp focus.

Trilobites enjoyed a great adaptive radiation during the Cambrian reaching their peak in abundance and diversity. In fact, Trilobites are the biostratigraphic standard for the Cambrian. They declined during the Ordovician and were only a minor part of the seafloor fauna in the Silurian and Devonian. Trilobites did enjoy some increase in diversity during the Devonian; however, they never fully recovered from the late Devonian extinction event and vanished during the Permian

Edit oh wait oops I didn’t look at the list carefully but should I include as overview then put specific info on the genuses on the list? Are they like going to also test like the overall ones on the list or just the specific ones? Sorry for so many questions...
Last edited by AwersomeUser on February 6th, 2019, 5:52 pm, edited 1 time in total.

UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

Re: Fossils B/C

Postby UTF-8 U+6211 U+662F » February 6th, 2019, 5:51 pm

Ok. Hi again. So trilobite has tons of species and stuff so do you think this is enough? Do I have list some order/family?

Trilobites range from the Cambrian to the Permian. Next to ostracodes they are the most common arthropod fossil. Trilobite means three-lobed and refers to the three longitudinal divisions of their calcified exoskeleton. An axial lobe running down the center is attached to pleural lobes on either side. The head or chephalon is separated from the tail or pygidium by thorasic segments. As juveniles, trilobites were pelagic, swimming in the plankton. As adults, most trilobites were benthic detritus feeders, although there are some exceptions such as the agnostids, which are thought to have lived a pelagic life due to their world-wide distribution. Trilobites were one of the first organisms to have eyes and may have been the first with eyes that focused images. Many trilobite species lost their eyes through selection such as the agnositds and Cryptolithus.

Trilobites have compound eyes made of calcite crystals. Two important types of compound eye can be found in trilobites. Holochroal eyes consisted of hundreds (up to 15,000) of closely packed elongated prisms of calcite arranged in a hexagonal pattern. The lenses of these eyes must be viewed with the aid of magnification. Holochroal eyes produced composite images of the world, but with little resolution. Phacops trilobites possessed schizochroal eyes. Schizochroal eyes are made of larger spherical-shaped lenses numbering in the hundreds (up to 700) and separated by exoskeleton. Each lens is made of two calcite crystals arranged as a doublet lens. Ironically, the doublet lens was designed by Dutch scientist Christian Huygens (1629-1695) and the French philosopher Rene Descartes (1586-1650) to correct for spherical aberration. Through selection nature had anticipated the same design 400 million years earlier. The phacopid lens produced larger images bringing them into sharp focus.

Trilobites enjoyed a great adaptive radiation during the Cambrian reaching their peak in abundance and diversity. In fact, Trilobites are the biostratigraphic standard for the Cambrian. They declined during the Ordovician and were only a minor part of the seafloor fauna in the Silurian and Devonian. Trilobites did enjoy some increase in diversity during the Devonian; however, they never fully recovered from the late Devonian extinction event and vanished during the Permian
You might want diagrams of trilobite anatomy

AwersomeUser
Member
Member
Posts: 116
Joined: December 8th, 2018, 5:20 am
Division: B

Re: Fossils B/C

Postby AwersomeUser » February 6th, 2019, 5:53 pm

Ok so are they like going to also test like the overall ones on the list or more of the more like specific ones? Sorry for so many questions...

User avatar
isotelus
Member
Member
Posts: 92
Joined: May 23rd, 2018, 6:32 pm
Division: C
State: TX

Re: Fossils B/C

Postby isotelus » February 6th, 2019, 5:58 pm

Ok so are they like going to also test like the overall ones on the list or more of the more like specific ones? Sorry for so many questions...
All of them. They can have specific genii or questions pertaining to all trilobites. This goes for everything on the list.
'19 Season B: Fossils, ELG, Solar System
'19 Nationals B: Parasitology (1st), Sci Quiz Bowl (10th), WAYTTTM (7th)
'20 Season C: A&P, Designer Genes, Protein Modeling, Ornithology

SLHS '23

User avatar
Unome
Moderator
Moderator
Posts: 4152
Joined: January 26th, 2014, 12:48 pm
Division: Grad
State: GA
Location: somewhere in the sciolyverse

Re: Fossils B/C

Postby Unome » February 7th, 2019, 10:31 am

Ok. Hi again. So trilobite has tons of species and stuff so do you think this is enough? Do I have list some order/family?

Trilobites range from the Cambrian to the Permian. Next to ostracodes they are the most common arthropod fossil. Trilobite means three-lobed and refers to the three longitudinal divisions of their calcified exoskeleton. An axial lobe running down the center is attached to pleural lobes on either side. The head or chephalon is separated from the tail or pygidium by thorasic segments. As juveniles, trilobites were pelagic, swimming in the plankton. As adults, most trilobites were benthic detritus feeders, although there are some exceptions such as the agnostids, which are thought to have lived a pelagic life due to their world-wide distribution. Trilobites were one of the first organisms to have eyes and may have been the first with eyes that focused images. Many trilobite species lost their eyes through selection such as the agnositds and Cryptolithus.

Trilobites have compound eyes made of calcite crystals. Two important types of compound eye can be found in trilobites. Holochroal eyes consisted of hundreds (up to 15,000) of closely packed elongated prisms of calcite arranged in a hexagonal pattern. The lenses of these eyes must be viewed with the aid of magnification. Holochroal eyes produced composite images of the world, but with little resolution. Phacops trilobites possessed schizochroal eyes. Schizochroal eyes are made of larger spherical-shaped lenses numbering in the hundreds (up to 700) and separated by exoskeleton. Each lens is made of two calcite crystals arranged as a doublet lens. Ironically, the doublet lens was designed by Dutch scientist Christian Huygens (1629-1695) and the French philosopher Rene Descartes (1586-1650) to correct for spherical aberration. Through selection nature had anticipated the same design 400 million years earlier. The phacopid lens produced larger images bringing them into sharp focus.

Trilobites enjoyed a great adaptive radiation during the Cambrian reaching their peak in abundance and diversity. In fact, Trilobites are the biostratigraphic standard for the Cambrian. They declined during the Ordovician and were only a minor part of the seafloor fauna in the Silurian and Devonian. Trilobites did enjoy some increase in diversity during the Devonian; however, they never fully recovered from the late Devonian extinction event and vanished during the Permian

Edit oh wait oops I didn’t look at the list carefully but should I include as overview then put specific info on the genuses on the list? Are they like going to also test like the overall ones on the list or just the specific ones? Sorry for so many questions...
That's good info, although in my opinion it could do with a bit of condensing (lots of unnecessary words in there). You've hit all the major points that are likely to be asked for trilobites in general.
Userpage
Chattahoochee High School Class of 2018
Georgia Tech Class of 2022

Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.

HippoLowercase
Member
Member
Posts: 9
Joined: February 5th, 2019, 6:00 pm

Re: Fossils B/C

Postby HippoLowercase » February 9th, 2019, 6:35 pm

Hey, does anyone know ways on how to differentiate pictures of equus and mesohippus other than looking at the number of toes? Sometimes the feet are hidden, so I want to know another reliable way to id them.

dchen22
Member
Member
Posts: 32
Joined: February 1st, 2019, 12:40 pm
Division: C
State: MA

Re: Fossils B/C

Postby dchen22 » February 10th, 2019, 5:41 am

Does anyone know if Favosites was reef forming?

UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

Re: Fossils B/C

Postby UTF-8 U+6211 U+662F » February 10th, 2019, 9:27 am

Does anyone know if Favosites was reef forming?
It was

Eureka314
Member
Member
Posts: 22
Joined: January 8th, 2016, 8:40 am
Division: C

Re: Fossils B/C

Postby Eureka314 » February 10th, 2019, 11:47 am

How in depth are we expected to study with topics like radiometric dating? Are the fundamentals enough or do we need to know the specific types like radiocarbon, potassium-argon, uranium-lead, etc?
2019 Events: Experimental Design, Wright Stuff, Fossils

UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

Re: Fossils B/C

Postby UTF-8 U+6211 U+662F » February 10th, 2019, 12:09 pm

How in depth are we expected to study with topics like radiometric dating? Are the fundamentals enough or do we need to know the specific types like radiocarbon, potassium-argon, uranium-lead, etc?
Know the fundamentals and have a list of half-lifes for different elements


Return to “2019 Study Events”

Who is online

Users browsing this forum: No registered users and 2 guests