4 votes
Accepted

What is this row of pits along the "upper lip" of theropod skulls?

They are called Nutrient Foramen which are innervation of blood vessels and nerves, you see the same thing in reptile and bird skulls (mammals tent to pack it all into one or two large openings). They ...
John's user avatar
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4 votes

How can paleontologists identify morphologically different fossils as members of the same species?

Radically different body shapes and sizes represent overall phenotype. Overall phenotype was used briefly in the 1960s and 1970s for species identification under a statistical distance method called "...
Karl Kjer's user avatar
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4 votes
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Largest crinoid species

Probably 40ft not 40m Without a species name any claim like this is dubious. The wiki quote is not from a primary source but a fluff book which makes it even more questionable. Unfortunately you are ...
John's user avatar
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3 votes
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Is there a database for fossilized coral reefs that have been reported?

Yes, have a read from: The Paleobiology Database (PBDB): A comprehensive online resource that compiles data on fossil occurrences from various scientific publications and databases. The Ocean ...
bandybabboon's user avatar
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3 votes

What is this fossilized claw found in a Belgian forest?

Looks like the proximal end of a rib of a large mammal (cow, horse, deer). Without information about how large it is, it is not possible to get closer to an identification. It's not a claw and very ...
kmm's user avatar
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3 votes
Accepted

Is bacillus strain 2-9-3 really 250 million year old?

Disclaimer I was unaware of 2-9-3, but performed a simple internet search which brought up a an open-access paper from 2001 refuting the claim, and nothing more recent, suggesting that the refutation ...
David's user avatar
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3 votes
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Are these 3.5B year old fossils the oldest on earth?

Yes, the study was peer reviewed and published less than a month ago (Dec 18, 2017) in PNAS, among the most prestigious journals in science by qualified experts. They could be wrong of course, like ...
Karl Kjer's user avatar
  • 7,663
2 votes

What could explain discrepancies between dates provided by the fossil record vs. the molecular clock?

First, the example you give is unusual in that molecular dating analysis should be calibrated with fossils to set minimum ages. If Ecrobia grimmi exists in the fossil record, then no proper molecular ...
Karl Kjer's user avatar
  • 7,663
2 votes

How exactly is the wood fossil process?

there are actually more than one process, but in the case of high detail wood fossils the process is the slow filling in of all the spaces in the wood (filled with water in life) with dissolved ...
John's user avatar
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2 votes
Accepted

How do carbon 13:12 ratios confirm the biological origin of oldest microfossils?

Via: https://en.wikipedia.org/wiki/Carbon-13#Uses_in_science Due to differential uptake in plants as well as marine carbonates of 13C, it is possible to use these isotopic signatures in earth ...
Alex Reynolds's user avatar
2 votes
Accepted

Is this a fossil?

No It bears no halmarks or indicators of being a fossil, and it does not look like any fossil I have ever seen . it looks like simple chemical weathering.
John's user avatar
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1 vote
Accepted

Estimates for the volume and mass of most ancestral multicellular organism, and a similar question for alive animals with radial symmetry

So, it looks like it all depends on how you define multicellular - living in mats/biofilms, which are often mixed species, isn't necessarily a multicellular organism, even though it can behave like ...
bob1's user avatar
  • 12.1k
1 vote

Were the Francevillian biota real?

Yes they are real. it is a a collection fossils that are different enough from modern forms it is difficult to say exactly what they are but they definitely exist. Occasionally someone proposes a ...
John's user avatar
  • 14.7k
1 vote

What is this fossilized claw found in a Belgian forest?

That's the distal end of an antler of some deer. You can tell because the texture is smooth and glossy, all wrong for a rib, and has that flange at the end which looks very different from the uncinate ...
user2352714's user avatar

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