Show Us Your Fossils Challenge Mode: Ordered By Geologic Time Period!

[siteseer]

Here's an unidentified tooth I bought with several other specimens from the same locality.  It has smooth enamel and is 1 1/2 inches (37mm) along its longest dimension.  I have another tooth much like it but it is much smaller and I've seen other teeth like it but this one is the largest I've seen.  In fact, it's large for a tooth of this age.  

 

I think it may be a tooth form of a chondrichthyan (cartiliagimous fish) related to Orodus.  This may be a lateral tooth of a taxon with different anterior teeth.

 

Thanks to Tim for the enlarged and brightened photos.

 

unidentified chondrichthyan

Early Carbonifierous (Mississippian)

Upper Burlington Limestone

Biggsville, Henderson County, Illinois

 

Edited November 21, 2022 by siteseer

[siteseer]

Cladodont
Late Carboniferous (Pennsylvanian)
Carbondale Formation
Marissa, St. Clair County, Illinois

 

This is a cladodont shark tooth in matrix that was collected in the late 1980's.  It measures just under 1 1/2 inches wide and just under an inch high.  It's rather eroded but remarkable for the size.  The tooth may be damaged from extended natural wear as teeth might not have been replaced as quickly as in modern sharks.

 

 

 

Edited November 21, 2022 by siteseer

[FranzBernhard]

11 hours ago, siteseer said:

Cladodont
Late Carboniferous (Pennsylvanian)
Carbondale Formation
Marissa, St. Clair County, Illinois

Thanks for the good info. But you know, no points for that one....

Franz Bernhard

[Notidanodon]

On 11/16/2022 at 8:25 AM, hemipristis said:

Trigonotodus serratus, Miocene Choptank Formation, Talbot County, Easter Shore of Maryland, USA

Nice tooth  how can you tell it’s not a megalodon? 

[Nimravis]

 

[siteseer]

9 hours ago, Notidanodon said:

Nice tooth  how can you tell it’s not a megalodon? 

 

I'm not sure what that is.  I think the crown should be narrower and more curved toward the tip.  It's pretty weathered but the root seems more like a megalodon root.  I haven't seen a lot of these so it would be great if some of the MD, VA, or SC collectors would take a look.

[siteseer]

On 11/16/2022 at 12:25 AM, hemipristis said:

Trigonotodus serratus, Miocene Choptank Formation, Talbot County, Easter Shore of Maryland, USA

 

I think more shark people should take a look at this.  @MarcoSr @fossilselachian @isurus90064 @sixgill pete @Northern Sharks @Al Dente .

[MeargleSchmeargl]

On 11/18/2022 at 9:31 AM, JamieLynn said:

@Pleuromya and @MeargleSchmeargl   Is there a "rule" that says if no one posts the next time period in say...24 hours, can we skip it and go on to the next? Precambrian and Paleocene seem to really bog down the run...

Sure, I don't see why not

[hemipristis]

13 hours ago, Notidanodon said:

Nice tooth  how can you tell it’s not a megalodon? 

 

3 hours ago, siteseer said:

 

I think more shark people should take a look at this.  @MarcoSr @fossilselachian @isurus90064 @sixgill pete @Northern Sharks @Al Dente .

When I first posted this tooth on either TFF or one of the Facebook fossil pages (I forget which. maybe Black RiverFossils?)--with many members belonging to both--some years ago, it was other shark people that told me it was not a meg, but a Trigonotodus.  I had thought it was a meg.  

 

I had nearly forgotten about this tooth until I was scavenging through the collection to post in this thread. Personally, it still looks like a meg to me, but I'll be honest.the Carcharocles lineage isn't my collecting focus..  

Edited November 23, 2022 by hemipristis

[Al Dente]

6 hours ago, siteseer said:

 

I'm not sure what that is.  I think the crown should be narrower and more curved toward the tip.  It's pretty weathered but the root seems more like a megalodon root.  I haven't seen a lot of these so it would be great if some of the MD, VA, or SC collectors would take a look.

 

2 hours ago, hemipristis said:

When I first posted this tooth on either TFF or one of the Facebook fossil pages (I forget which. maybe Black RiverFossils?)--with many members belonging to both--some years ago, it was other shark people that told me it was not a meg, but a Trigonotodus.  I had thought it was a meg.  

Probably Alopias palatasi.

 

[Wrangellian]

We've seen these before (and I've posted this elsewhere too) but here is my...

Pteronisculus cicatrosus

Early Triassic: Olenekian: Dienerian

Beaufort Gp, Sakamena Fm.

Ambilobe, N. Madagascar

... if my info is correct.

 

[rocket]

oh, Jurassic, wow, one of the best site for lower jurassic ammonites is the yorkshire-coast in NE-Britain.

The lower lias contains well colored Psiloceras-Ammonites, I show a piece of shale with two in blue, yellow and green (not my art, it´s real :-))

Size of the ammonites is around 5 - 6 cm

 

 

 

Edited November 23, 2022 by rocket

[historianmichael]

Baculites texanus

Late Cretaceous Period

Wenonah Formation

New Jersey

 

[MarcoSr]

10 hours ago, siteseer said:

 

I think more shark people should take a look at this.  @MarcoSr @fossilselachian @isurus90064 @sixgill pete @Northern Sharks @Al Dente .

 

4 hours ago, Al Dente said:

 

Probably Alopias palatasi.

 

 

7 hours ago, hemipristis said:

 

When I first posted this tooth on either TFF or one of the Facebook fossil pages (I forget which. maybe Black RiverFossils?)--with many members belonging to both--some years ago, it was other shark people that told me it was not a meg, but a Trigonotodus.  I had thought it was a meg.  

 

I had nearly forgotten about this tooth until I was scavenging through the collection to post in this thread. Personally, it still looks like a meg to me, but I'll be honest.the Carcharocles lineage isn't my collecting focus..  

 

I look for 6 sets of features on the lingual side of the tooth to help distinguish between Alopias/Trigonotodus and O. megalodon.  The root shape on top (gradual slope, deep U etc.) and root lobe shapes are two features.  However, with an upper lateral Alopias (giant thresher) root shape can be very similar to O. megalodon.   However, this tooth looks like the root lobes neck inward (could be damage making it appear that way) which is a feature on O. megalodon. The crown shape, another feature, with an upper lateral Alopias (giant thresher) can be very similar to O. megalodon.  The crown shoulders on the Alopias (giant thresher) have an outward bulge, but wear on this tooth is obscuring this feature.  The Alopias (giant thresher) serations are more ragged and non-uniform than a O. megalodon, but again wear is obscuring this feature.  Whether the tooth has a distinct bourlette is another feature to look at.  Again wear is obscuring this feature.  The bottom of the root is rounded by the middle of the crown on an Alopias (giant thresher) whereas an O. megalodon has a bourlette that tends to be triangular and comes to a point near the middle of the crown.  This tooth shows a definite triangular area coming to a point where the bourlette would be.  So based upon what I see in this lingual view I definitely lean toward O. megalodon.

 

 

 

 

 

However, a labial view of the tooth would also show two additional features that help distinguish Alopias (giant thresher) from O. Megalodon.  Please post a labial view of the tooth.

 

Marco Sr.

[JamieLynn]

Since we had at one point discussed breaking the Cretaceous into Lower and Upper (since there's SO MUCH OF IT) I am posting "out of order" a Lower Cretaceous because I don't get to catch the Cretaceous very often!! Give Historianmicheal his point...I don't care about the points.

Comtulid Crinoid Not Identified (as far as we know, these have not been ID'd)

Size 3/8 inch

 

[FranzBernhard]

20 minutes ago, JamieLynn said:

I don't care about the points.

Not eager winning some Austrian upper Cretaceous fossils? Rudists and the like ?
Franz Bernhard

[Mochaccino]

3 hours ago, FranzBernhard said:

Not eager winning some Austrian upper Cretaceous fossils? Rudists and the like ?
Franz Bernhard

 

May I ask what the points are currently? I'd be interested in winning some of those fossils, but at the rate the posts have been going I might not be able to keep up. So if there is someone currently going hard for the win, I might wait for the next round instead of competing against them.

[Ludwigia]

In my opinion, the major activity here should still be posting our interesting finds in order of appearance in the chronological record, not that of trying to win a competition, so I would suggest to Mochaccino that he continue showing us his fossils, regardless of his point standing.

[FranzBernhard]

17 minutes ago, Mochaccino said:

May I ask what the points are currently?

Here we go:

@JamieLynn: 7 points.

@rocket: 5 points.

@Ludwigia: 4 points.

@Nimravis, @siteseer: 3 points.

@historianmichael, @Wrangellian: 1 point.

 

1 point for each entry in correct order.

1 extra point for size.

1 extra point for how and when acquired.

1 or 2 extra points for extra info (highly subjective!).

Will run until December 31st, 2022.

 

Its all for good fun and education, not winning .

 

Franz Bernhard

[sixgill pete]

Paleocene Aquia Formation

 

Obtained 2-15-2015 through a trade of micro sediments with forum member @MarcoSr

 

Odontaspis winkleri

 

a small (~1/4") beautiful tooth

 

  

[FranzBernhard]

8 minutes ago, Ludwigia said:

In my opinion, the major activity here should still be posting our interesting finds in order of appearance in the chronological record, not that of trying to win a competition, so I would suggest to Mochaccino that he continue showing us his fossils, regardless of his point standing.

Yeah! The points and prize should only add to the fun and education. Some people are competitive, so giving points and a prize may attract additional posters.

Important thing is the chronological order and as much info about the specimen as possible. @Ludwigia, you did a good job with this crinoids!

Franz Bernhard

[sixgill pete]

Eocene Castle Hayne Formation 

 

found by me March 23 2023

 

a nice brachiopod @Tidgy's Dad

 

Terebratulina lachryma

 

   

 

 

[sixgill pete]

From the Oligocene River Bend and the Oligocene Belgrade Formations of North Carolina

 

A smorgasbord of Oligocene fossils found by me at a local quarry during the 2010's

 

 

 

[sixgill pete]

From the Miocene Pungo River Formation of North Carolina

 

Collected by myself sometime around 2008

 

a pair of hard to find

 

Ecphora tricostata

 

   

[sixgill pete]

From thew Pliocene Yorktown Formation of North Carolina

 

Found during May of 2022

 

an Ecphora quadricostata