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

[Coco]

Rimella fissUrella Nice shell.

 

Coco

[siteseer]

Here's an association piece with a shark tooth and some shells.

 

Physogaleus latus (extinct relative of tiger sharks) with mollusks

Late Oligocene

Sternberger Gestein

Kobrow, Germany

 

Edited October 23, 2022 by siteseer

[siteseer]

Here's a Heterodontus (horn shark aka bullhead shark) dorsal fin spine from the Middle Miocene Sharktooth Hill Bonebed, Bakertfield, California.  It's just under 3 1/2 inches (88mm long).  Horn sharks bear one spine on the leading edge of both dorsal fins.  They provide some defense against some predators.  The shiny surface towards the tip is not enameloid.  It's an outer layer of dentin.  Horn shark spines are quite rare in the fossil record.  The STH bonebed is one of the few layers in which you can find them but they are rare.  I have two specimens but received both as gifts.  I didn't find even a piece of one in 14 years of collecting. 

Edited October 23, 2022 by siteseer
additional thought

[Mochaccino]

22 hours ago, FranzBernhard said:

Next one should be Paleocene.

 

To keep some order, I am starting a small contest. It will last 10 rounds from now, the winner will get some specimens from the Kainach Gosau, polished and unpolished (ugh!!)

One point for each entry in correct order. Two or more successive entries by one and the same person are only counted once. I will think about subtracting points instead, but not yet . (That would be a good way to avoid getting some of those ugly Kainach fossils, though! )

That´s all about the rules at the moment. Still have fun with strange, beautiful and rare specimens. The ugly and weathered ones (my specimens) are out for now .

Franz Bernhard

 

Fun idea for a contest! 
 

For the Pliocene, a hunk of coral/sea life with calcite crystals from the Florida Everglades of South Florida, USA. I have no clue on further ID so if anyone has any ideas let me know.

 

[Kasia]

Bison skull, Pleistocene, Krasnodar, Russia

[Din0]

Never mind :b

 

 

Edited October 23, 2022 by Din0

[Mark Kmiecik]

20 minutes ago, Din0 said:

Here is a piece of a vertebrae from a Mosasaur that I just got identified yesterday. I love it dearly. I found it at Ladonia Texas. 

Late Cretaceous? A bit out of sequence.

 

 

 

Edited October 23, 2022 by Mark Kmiecik
fix typo

[Din0]

3 minutes ago, Mark Kmiecik said:

Late Cretaceous?

Yes it is late Cretaceous sorry for not putting it on. 

[Pleuromya]

A piece of Banded Iron from the Krivoy Rog supergroup of Ukraine. It is Palaeoproterozoic at 2.4 billion years. 

[Ludwigia]

1 hour ago, Din0 said:

Yes it is late Cretaceous sorry for not putting it on. 

I don't think you understand. We are posting things in a particular order here and your Cretaceous fossil, although interesting, doesn't fit the sequence. I would suggest you go to the beginning of this thread and read on to get an understanding.

[Din0]

Oh okay- thank you for telling me my error. Thank you for the advice and if I have a fossil that fits in our sequence I’ll be sure to post it.

[rocket]

Cambrian, big double Cambropallas from Morocco, Jbel Oubnate, bit restored

nearly 30 cm lenght 

 

 

[Mochaccino]

For the Ordovician, a curved nautiloid known as Richardsonoceras simplex from the Grand Detour Fm. of Rock County, Wisconsin, USA. This is a steinkern as is typical for the fossils of this locality. Noteworthy on this specimen is preservation of the siphuncle (or at least its cast).

 

[Kane]

For the Silurian, half a very rare Stelckaspis sp. from northern Ontario, and some algae (newly described).

[Kane]

And I’ll hog the Ordovician with a Pseudogygites latimarginatus roller from the Cobourg Fm I picked up on my way back from the north.

[Kane]

And I’ll take the Devonian with this enormous genal of the massive lichid, the much coveted Terataspis grandis. 

[Mochaccino]

For the Mississippian, a Strimplecrinus inornatus crinoid crown from the Hampton formation of LeGrand, Iowa, USA. Crinoids from this locality are known to be consistently preserved in beautiful species-specific coloration, with this one being the characteristic dark brown.

 

[rocket]

10 minutes ago, Mochaccino said:

For the Mississippian, a Strimplecrinus inornatus crinoid crown from the Hampton formation of LeGrand, Iowa, USA. Crinoids from this locality are known to be consistently preserved in beautiful species-specific coloration, with this one being the characteristic dark brown.

 

 

wow, wonderful, like freshly picked in the garden 

[Mochaccino]

40 minutes ago, rocket said:

 

wow, wonderful, like freshly picked in the garden 

Yep, one of my gems

[Mark Kmiecik]

Carboniferous period. Pennsylvanian. Moscovian/Kasinovian boundary. Francis Creek Shale member overlying the Colchester Coal, Carbondale Formation. Mazon Creek of NE Illinois, USA. 307 million years old.

 

[rocket]

Permian, oh, great, we have a lot 

Branchiosaur, Apateon sp., from Permian of sw-germany, Pfalz-Region, Heimkirchen

Small Temnospondyl, around 10 cm

 

 

[Notidanodon]

Triassic plesiosaur, ichthyosaur and severnichthys fish tooth from the westbury formation of penarth wales  

[pachy-pleuro-whatnot-odon]

2 minutes ago, will stevenson said:

Triassic plesiosaur, ichthyosaur and severnichthys fish tooth from the westbury formation of penarth wales  

 

Awesome combination-piece, Will! I'd say it's very rare to find so many pieces from different animals in association in general, but especially when plesiosaur fossils are concerned!

[Notidanodon]

25 minutes ago, pachy-pleuro-whatnot-odon said:

 

Awesome combination-piece, Will! I'd say it's very rare to find so many pieces from different animals in association in general, but especially when plesiosaur fossils are concerned!

Thanks  it is fairly unusual yes and I got it for a bargain off our favourite auction site!

[Kasia]

Psiloceras ammonite, Jurassic, Somerset, UK