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Re: Fossils B/C

Posted: January 18th, 2011, 7:50 am
by Flavorflav
lllazar wrote:Yes i was thinking along the exact same lines until i saw that one of them was a replica made for sale. And then i got the idea that maybe it was a plesiosaur paddle and the second one is a replica, but they thought it was a mosasaur paddle, so they named it as so. They are just so similar even in orientation that accounting for the fact that they were two very similar body parts in terms of function, it still seems impossible to believe they are of different genii.

But yes, honestly the tests mostly cover identification of invertebrates, as it is difficult to get numerous vertebrate fossils and also pictures can be vague at times, such as this one.
It's a mosasaur. This is a plesiosaur:
Image
This is a mosasaur:
Image
The mosasaur's looks much more like a hand, but also look at the shape of the individual bones - all block shaped in the plesiosaur, much mire elongate/hourglassish in the mosasaur. Look especially at the tibia and fibula.

Re: Fossils B/C

Posted: January 18th, 2011, 8:26 am
by gneissisnice
lllazar wrote:Ehh, R&M is pretty awesome too, though ive never done it, i've looked at past tests and other people's thoughts, and it's a worthy replacement for fossils.
Rocks and Minerals is a fantastic event. My favorite, even more so than Fossils (but only a little bit).

Re: Fossils B/C

Posted: January 18th, 2011, 10:04 am
by Witchy
Ha xD I have an AMAZING friend who coaches for our fossils and R&M teams, but we covered most of the fossils material so lately he's been getting this evil smile and talking about rocks. Since he's a junior this year, he's glad he can compete again next year.

Could someone explain to me what the basic preservation types are? It's what I have the hardest time with.

Re: Fossils B/C

Posted: January 18th, 2011, 1:52 pm
by quizbowl
Witchy wrote:Ha xD I have an AMAZING friend who coaches for our fossils and R&M teams, but we covered most of the fossils material so lately he's been getting this evil smile and talking about rocks. Since he's a junior this year, he's glad he can compete again next year.

Could someone explain to me what the basic preservation types are? It's what I have the hardest time with.
Also, what is the best way to distinguish them when you see it?

Re: Fossils B/C

Posted: January 19th, 2011, 8:20 am
by littlea53
quizbowl wrote:
Witchy wrote:Ha xD I have an AMAZING friend who coaches for our fossils and R&M teams, but we covered most of the fossils material so lately he's been getting this evil smile and talking about rocks. Since he's a junior this year, he's glad he can compete again next year.

Could someone explain to me what the basic preservation types are? It's what I have the hardest time with.
Also, what is the best way to distinguish them when you see it?
Some of the basic preseravation types are
Trace Fossils which are footprints and such,
Carbon Impriting(or Carbonizing which normal occurs in plants and soft organisms. The remains are crushed beneth the weight of the rock. The gases, including hydrogen, nitrogen and oxygen, are off gassed through the process of heat and compression. What is left behind is a carbon film, an impression of the former living thing.),
&
Petrifaction occurs when a porous material such as a bone or shell becomes filled with preserving material such as calcium carbonate or silica. one of the most widly known yet

Re: Fossils B/C

Posted: January 19th, 2011, 11:30 am
by teppy2
Anyone have any tips for distinguishing Baculites from Belemnitella

Re: Fossils B/C

Posted: January 19th, 2011, 11:43 am
by Kokonilly
teppy2 wrote:Anyone have any tips for distinguishing Baculites from Belemnitella
To me, Belemnitella are more like darts or the tip of a pencil - they taper off at the end. I don't think Baculites do that at all.

Re: Fossils B/C

Posted: January 19th, 2011, 10:15 pm
by lllazar
Baculites also have complex suture patterns while belemnitella have no suture pattern.

Re: Fossils B/C

Posted: January 20th, 2011, 7:24 pm
by disneyfan1206
teppy2 wrote:Anyone have any tips for distinguishing Baculites from Belemnitella
Usually baculites are broken so the pics will only be like a section...mostly lol

Re: Fossils B/C

Posted: January 20th, 2011, 7:25 pm
by disneyfan1206
does anyone have a good link to a glossary for fossil terms i can print out?