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August 2019 - Finds of the Month Entries

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fossil_sea_urchin

It's plesiosaur because it's hourglass-shaped, unlike the disc-shaped ichthyosaur paddle digits. The bone is about the right size for Plesiosaurus and plesiosaurus is by far the most abundant plesiosaur in the formation. The species was just a guess, but there's only one known species of Plesiosaurus.

@JohnJ

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fossil_sea_urchin
11 minutes ago, JohnJ said:

 

Since accurate information is also part of the FOTM mission, your find may be better described as part of an "unknown plesiosaurid".  Dr. Adam S. Smith mentions a greater diversity of plesiosaurids are known for that area.

;)

It can't be the rhomaleosaurid because it's not elongated at all, which is typical of that group. It can't be Seeleyosaurus or Hydrorion either because they come from Germany and have no definitive remains from the UK.

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fossil_sea_urchin

Attenborosaurus and Archaeonectrus are usually classified as pliosaurids which often have quite elongated paddle digits unlike plesiosaurs that have more robust digits in the middle of the paddle.

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JohnJ
38 minutes ago, fossil_sea_urchin said:

Attenborosaurus and Archaeonectrus are usually classified as pliosaurids which often have quite elongated paddle digits unlike plesiosaurs that have more robust digits in the middle of the paddle.

 

:)

You have the advantage of the specimen in hand; we have only seen two dark photos.  

 

It's good that you have tried to accurately identify your specimen.  @Auspex offers good advice...another hedge against the probability there was more than one species of Plesiosaur in those waters at the time.  ;)

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fossil_sea_urchin
11 minutes ago, Auspex said:

This is a wonderful discussion! Lots of solid, arcane information. Thank you!
In the end, it may be wise to hedge to the conservative side and call it "Plesiosaurid cf Plesiosaurus dolichodeirus. This is as much as the physical evidence can say, and the "CF" allows for informed speculation. :)

Agreed:)

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digit

Very cool! I love seeing shark teeth that I never knew about before. ;)

 

 

Cheers.

 

-Ken

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fifbrindacier
On 8/17/2019 at 11:45 AM, Welsh Wizard said:

Ichthyosaurus sp, possibly a communis

Jurassic

Hettangian - circa 190 million years

Lavernock Point, UK

Preplanobis beds

Length of the specimen is about 1.5 metre

Superb !:envy::envy::envy::envy:

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JohnBrewer
On 8/17/2019 at 11:45 AM, Welsh Wizard said:

Ichthyosaurus sp, possibly a communis

Jurassic

Hettangian - circa 190 million years

Lavernock Point, UK

Preplanobis beds

Length of the specimen is about 1.5 metre

Stunning!

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JohnBrewer

Judging by the length of its jaw and the location I’d say I. communis is a high probability. 

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Welsh Wizard

Hi JohnBrewer and fifbrindacier. 

 

Thanks for the comments. Much appreciated.

 

Nick

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digit

Now there's something you don't see every day. ;)

 

Shaping up to be another great and diverse month for the FOTM contest.

 

 

Cheers.

 

-Ken

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MeargleSchmeargl

Watching from Uni with great anticipation! :D

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fossilsonwheels
On 8/19/2019 at 5:26 PM, deutscheben said:

I would like to add my most recent shark find to the contest for this month: 

Found: 8/17/19

Name: Listracanthus hystrix (4 associated shark dermal denticles)

Location: Starved Rock Clay Products Pit, Utica, IL

Geologic Age/Formation: Pennsylvanian, Mecca Quarry Shale Member of the Carbondale Formation 

20190819_082144-1.thumb.jpg.05e559cd1ac6f145f95f4d059da381ae.jpg

Fantastic find !!!! Beautiful detail. Mine is quite difficult to see so I am a little jealous. 

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Scylla
On 8/7/2019 at 12:53 PM, FranzBernhard said:

:D:D LOL!!

So, my area has already transformed into Florida ;). Too hot or too many thunderstorms or too rainy during the summer, incl. all kinds of bugs. Winter is much better, only a few weeks with frost and snow left - best time to prospect (no vegetation) and also to dig (still not hot).

Franz Bernhard

Unfortunately, it seems that many places are changing into Florida as far as weather patterns go. Florida is changing into Atlantis:o

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