100 million years old?

by Mary A.
(Model, Colorado)

Cretaceous fossil?

Found these in an arroyo in southeastern Colorado. I am really interested in what exactly they are.

Comments for 100 million years old?

ms riverbluff - tn naked mouse rock fossil ?
by: jesse terrell hinds

I HAD PROPERTY IN TIPTON CO. TN. IN 1985 -APPROX 300 ACRE FUTURE LEISURE PROPERTY SUB DIVISON-WHICH INCLUDED A 100 FT WIND BLOWN RIVER BLUFF OVER LOOKING THE MISSISSIPPI RIVER AT THE BEND THAT TURNS THE RIVER TO MEMPHIS TN.- I WAS WALKING DOWN A NEWELY CONSTRUCTED ROAD AT THE POINT WHERE YOU COULD TURN WEST & GO TO THE OVER LOOK OF THE RIVER- I SAW THIS ROCK & ON CLOSER OBSERVATION I SAW THIS FOSSIL- WHICH CONSISTED OF A CLEAR BACK BONE & RIB CAGE- APPROX 8 RIBS ON EACH SIDE OF THE BACK BONE -ALL STILL ATACHED & VERY VISABILE- EVIDENTLY THE ROAD GRADER BLADE HAD SHAVED OFF THE TOP AREA WITHOUT DAMAGING THE FOSSIL- NO PART OF THE FOSSIL IS DAMAGED . MY ADDRESS IS 124 LEGION PARK LOOP-MIRMAR BEACH , FL 32550-CELL 901 351 7843-AKA TERRY HINDS

Trace Fossils
by: Michael

Looks like you have found some fossil burrow-fills. A small creature (worm or crustacean, maybe) burrowed down below the sea floor at the time and left behind the evidence of its activity - perhaps feeding or sheltering. This is why they are generically called "Trace Fossils" rather than "Body Fossils" as they are traces of the lives of living creatures recorded in the sediments.

Cretaceous Fossil
by: Douglas

Mary,

Assuming you found this near Model it is from the Cretaceous Period. which does make it 65 to 100 million years old. I can't identify any fossils on this piece but it looks like there may be more than one.

You can learn more about the Cretaceous Period here:

https://www.fossils-facts-and-finds.com/cretaceous_period.html

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