1. List the following strata in order from oldest to youngest.
2. How can relative dating be used to help date fossils?
1. C, B, A, D, E (And then erosion of A and formation of the dirt layer? Not too sure how A became flat on the top and how D became exposed on the surface. Should probably know this stuff if I'm doing GeoMapping.)
2. Relative dating can be used to determine if two fossils are of around the same age, or if one is older and which. This can be especially helpful in conjunction with the use of index fossils and radioactive dating methods.
Yeah pretty much. And I guess D could potentially be a sill or dyke that pushed its way to the surface but I'm not quite sure either.
1) Identify this fossil to the most specific taxon allowed by the Fossils List.
2) What is the particular geological significance of this fossil?
3) What period was this specimen alive during?
Re: Fossils B/C
Posted: October 15th, 2018, 3:28 pm
by isotelus
1. Genus Glossopteris
2. It was best known for being found on both South America and Africa, thus proving the two continents must have been connected at some point
3. Permian
Re: Fossils B/C
Posted: October 15th, 2018, 4:03 pm
by UTF-8 U+6211 U+662F
isotelus wrote:
1. Genus Glossopteris
2. It was best known for being found on both South America and Africa, thus proving the two continents must have been connected at some point
3. Permian
Yep, your turn! (Nice username.)
Re: Fossils B/C
Posted: October 16th, 2018, 6:05 pm
by isotelus
UTF-8 U+6211 U+662F wrote:
isotelus wrote:
1. Genus Glossopteris
2. It was best known for being found on both South America and Africa, thus proving the two continents must have been connected at some point
3. Permian
4. Explain the method of permineralization and replacement.
5. What are ichnofossils?
Re: Fossils B/C
Posted: October 16th, 2018, 6:26 pm
by UTF-8 U+6211 U+662F
isotelus wrote:
UTF-8 U+6211 U+662F wrote:
isotelus wrote:
1. Genus Glossopteris
2. It was best known for being found on both South America and Africa, thus proving the two continents must have been connected at some point
3. Permian
4. Explain the method of permineralization and replacement.
5. What are ichnofossils?
Haven't done this in a while...
1. Permineralization
2. Carbonization
3. Replacement
4. Permineralization and replacement are the two methods of petrification. Permineralization is when mineral-rich groundwater infiltrates the bone/shell/wood of the fossil. These minerals deposit into stone which remain after the original organic material disappears. Replacement is when mineral-rich groundwater dissolves the original material, replicating the microscopic structure in stone. It takes place slowly and is not often found alone without permineralization.
5. Ichnofossils, or trace fossils, are fossils that indicate biological activity, e.g. trails, tracks, burrows, and even coprolites.
Re: Fossils B/C
Posted: October 17th, 2018, 8:06 pm
by isotelus
Nice job- however, 3. is actually mummification (desiccation). Basically, they're dried out. Go ahead!
Re: Fossils B/C
Posted: October 18th, 2018, 12:30 pm
by UTF-8 U+6211 U+662F
isotelus wrote:Nice job- however, 3. is actually mummification (desiccation). Basically, they're dried out. Go ahead!
1) Identify the fossil.
2) Explain its significance.
3) When was it discovered?
4) When did it live?
5) What discovery was made in Poland which brought controversy over this fossil? What do the fossils found in Poland suggest about this fossil?
Re: Fossils B/C
Posted: October 19th, 2018, 4:17 pm
by Bread
I think I got this
1. Genus Tiktaalik
2. Genus Tiktaalik is a transitional fossil meaning that it has an evolutionary transition being from fish to four legged animals
3. 2004
4. Devonian
5. In a Poland quarry tracks were found that suggested that the many tetrapods existed long before the genus tiktaalik. This caused controversy as one side said that the theory of tetrapod evolution should be reorganized or modified while the other side said that the evidence wasn't sufficient enough to redo the whole thing.
Re: Fossils B/C
Posted: October 19th, 2018, 4:37 pm
by UTF-8 U+6211 U+662F
Bread wrote:I think I got this
1. Genus Tiktaalik
2. Genus Tiktaalik is a transitional fossil meaning that it has an evolutionary transition being from fish to four legged animals
3. 2004
4. Devonian
5. In a Poland quarry tracks were found that suggested that the many tetrapods existed long before the genus tiktaalik. This caused controversy as one side said that the theory of tetrapod evolution should be reorganized or modified while the other side said that the evidence wasn't sufficient enough to redo the whole thing.
Yep!
You might want to mention that the tetrapods found could have coexisted with their ancestor or that the tetrapods found and Tiktaalik could share a common ancestor (making Tiktaalik possibly an evolutionary dead end).
