Hit The Deck Posted October 26, 2012 Share Posted October 26, 2012 My daughter found this on the HGMS field trip to Midlothian Texas last Saturday upper Creaceous possable Atco Formation or the chalk above? is this a jelly fish? I'm not sure what to look for to ID. She said it was a TV lol Link to comment Share on other sites More sharing options...
Foshunter Posted October 26, 2012 Share Posted October 26, 2012 She has a good eye, Fred & Wilma Flintstone's TV, I don't have a clue what it is, hope you get an answer---Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
Auspex Posted October 26, 2012 Share Posted October 26, 2012 As it seems to bridge two layers of the rock, I will suggest that it is a mineral stain, infiltrated after the layers cracked and separated slightly; the darker area is the last point of close contact before complete separation. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
FossilDAWG Posted October 26, 2012 Share Posted October 26, 2012 I agree, a mineral stain, or possibly due to differential oxidation. Sometimes oxygen can penetrate a certain distance into the rock, oxidizing the periphery and causing a color change, for example in iron minerals. The center remains unoxidized, and so has a different color. Don Link to comment Share on other sites More sharing options...
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