Scioly.org

UTF-8 U+6211 U+662F wrote:

bmd234 wrote:

dxu46 wrote:

Questions: (Click to Show Hidden Text)

Given two similar looking fossils, list how you would distinguish them:
1. Allosaurus vs. Tyrannosaurus (you're only given the skull so size is not an option)
2. Equus vs. Mesohippus (you're not given a picture of their feet)
3. Mammut vs. Mammuthus
4. Exogyra vs. Gryphaea
5. Acer vs. Platanus

Use

Code: Select all

[hide]Answer|asdfjaksdjfkj[/hide]

or

Code: Select all

[answer]asdfjakjsdkjf[/answer]

for better results

bmd234 wrote:New Question!

1. Explain Niles Eldredge's theory of Punctuated Equilibrium.

2. Explain the difference between a Deuterostome and a Protostome.

3. Explain how the Petoskey Stone was named.

4. What is the origin of Rafinesquina's name? (Explain it's Genus name, and its "cursed" nickname)

1. Punctuated equilibrium is one of the theories of evolution that states organisms tend to show little evolutionary change (stasis), unless during rapid periods of speciation and cladogenesis associated with rapid changes.

2. During embryonic development in most Bilateria, an invagination of the embryo creates a blastopore which will later become the gut. In protostomes, the blastopore end becomes the mouth while in deuterostomes, the blastopore end becomes the anus.

3. The Petoskey Stone is the polished version of Hexagonaria specimens. It is named after the city of Petoskey in Michigan, where it was commonly found. The city in turn, was named after either a Native American chief or a Polish family.

4. Rafinesquina is named after Constantine Samuel Rafinesque-Schmaltz, a French polymath who suggested that organisms evolved before Darwin. Rafinesquina is often called cursed because it trapped and suffocated large numbers of lingulids under its shell.

dchen22 wrote:

bmd234 wrote:New Question!

1. Explain Niles Eldredge's theory of Punctuated Equilibrium.

2. Explain the difference between a Deuterostome and a Protostome.

3. Explain how the Petoskey Stone was named.

4. What is the origin of Rafinesquina's name? (Explain it's Genus name, and its "cursed" nickname)

Click to Show Answer

1. Punctuated equilibrium is one of the theories of evolution that states organisms tend to show little evolutionary change (stasis), unless during rapid periods of speciation and cladogenesis associated with rapid changes.

2. During embryonic development in most Bilateria, an invagination of the embryo creates a blastopore which will later become the gut. In protostomes, the blastopore end becomes the mouth while in deuterostomes, the blastopore end becomes the anus.

3. The Petoskey Stone is the polished version of Hexagonaria specimens. It is named after the city of Petoskey in Michigan, where it was commonly found. The city in turn, was named after either a Native American chief or a Polish family.

4. Rafinesquina is named after Constantine Samuel Rafinesque-Schmaltz, a French polymath who suggested that organisms evolved before Darwin. Rafinesquina is often called cursed because it trapped and suffocated large numbers of lingulids under its shell.

dchen22 wrote:

Images (Click to Show Hidden Text)

A.[img]http://www.thefossilforum.com/uploads/monthly_05_2010/post-2572-12735833042697.jpg[/img]
B.[img]https://www.sciencephoto.com/image/692092/800wm[/img]
C.[img]https://0.allegroimg.com/s512/03e944/8f99890d40faacede9c9e08cecf0[/img]

1. Identify specimens A, B, and C.
2. What part of specimen A is preserved?
3. What are the "spaces" between the chains in specimen B called? Name a purpose for this feature.
4. What is an ancestrula (regarding specimen C)?

1. [i]Astraeospongia[/i], [i]Halysites[/i], [i]Rhombopora[/i]
2. Spicule
3. Not sure, but the spacing allows the coral to secrete less calcite while adding polyps and maximizes distance between them
4. The first zooid which secondary ones bud from

wec01 wrote:

dchen22 wrote:

Images (Click to Show Hidden Text)

A.[img]http://www.thefossilforum.com/uploads/monthly_05_2010/post-2572-12735833042697.jpg[/img]
B.[img]https://www.sciencephoto.com/image/692092/800wm[/img]
C.[img]https://0.allegroimg.com/s512/03e944/8f99890d40faacede9c9e08cecf0[/img]

1. Identify specimens A, B, and C.
2. What part of specimen A is preserved?
3. What are the "spaces" between the chains in specimen B called? Name a purpose for this feature.
4. What is an ancestrula (regarding specimen C)?

Answers (Click to Show Hidden Text)

1. [i]Astraeospongia[/i], [i]Halysites[/i], [i]Rhombopora[/i]
2. Spicule
3. Not sure, but the spacing allows the coral to secrete less calcite while adding polyps and maximizes distance between them
4. The first zooid which secondary ones bud from

For 3, they are called lacunae and another function is that they can fill with sediment to stabilize the coral.

wec01 wrote:1. What chemical can be used to separate a limestone matrix from a silicified fossil?
2. Explain the process of carbonization.
3. What general environment does limestone suggest?

1.HCl

2.more volatile substances of plants and animals decay, but leave behind the carbon. 

3.marine

hmmm wrote:

wec01 wrote:1. What chemical can be used to separate a limestone matrix from a silicified fossil?
2. Explain the process of carbonization.
3. What general environment does limestone suggest?

Click to Show Answer

1.HCl

2.more volatile substances of plants and animals decay, but leave behind the carbon. 

3.marine