Unidentified specimens from Rock Crossing in OK (Ordovician)

[electricshaman]

A few of the more interesting specimens found at Rock Crossing in the Criner Hills area (southern Carter Co.) of Oklahoma's Arbuckles region on September 19. Bromide Formation, Middle Ordovician. However, some of these were found in the alluvium along the banks of the creek at the same site, where there are some Devonian-age Hunton Group exposures upstream. We've had a record amount of rainfall this year and this site was exposed to some very destructive flooding 3 months prior. It's very possible that some of these are Devonian in age from the exposures upstream.

Very large bryozoans in there, but I'm not sure of the others. Possibly stromatoporoids?

#1

#2

#2 (reverse):

#3

#3 (reverse)

#4

#4 (rotated)

#5

#5 (rotated)

Edited November 28, 2015 by electricshaman

[Rockwood]

I predict that opinions will vary on these due to the state of preservation, but I'll give it a try.

#1 I give up. Too much conflicting information.

#2 The break is a pretty good indication that these are bryozoan pieces.

#3 +4 Possibly a bryozoan crinoid mix. Could be lined burrows or worm tubes though.

#4 Crinoid hash.

#5 Possibly a crustacean ?

[Guguita2104]

Welcome to the Forum!

1-Rugose solitary coral;

4-I see some crinoid stems.

Regards,

Guguita

[SteveS]

#4 is a lot like many rocks dumped here in MN. A small fossil graveyard with a bunch of Crinoid stems sticking out being the most obvious. I actually have one similar to number 5 I've never figured out either.

[electricshaman]

Is it possible that #5 could be a piece of fossilized seafloor with that wave-shaped sediment pattern? It sort of resembles some of the patterns I've seen in lakes and oceans near the beach. But I would expect to see a lot of accumulated small organisms and debris in that case.

[Auspex]

Is it possible that #5 could be a piece of fossilized seafloor with that wave-shaped sediment pattern? It sort of resembles some of the patterns I've seen in lakes and oceans near the beach. But I would expect to see a lot of accumulated small organisms and debris in that case.

I think that #4:

may be a better candidate for 'sea floor mark', but is is more consistent with bioturbation than wave action.

#5 looks more like some kind of organic remains, but it is very worn.