Bob Saunders Posted November 25, 2019 Share Posted November 25, 2019 This is a chunk of Michigan clay with sand and probably calcium. I do not know yet if I can do much with it other than perhaps cut down the size to have the fossils. Don't know if a hack saw would help much. all are like micro size and one looks like an Crinoid Archimedes screw 0.7 cm x 0.3 cm. I would like to know what is the tire track like tract line? 5/8th inch, or 0.1 x 1.59 cm or 15.8750 mm. Is this an actual fossil or impression left by a life form. Two are with my phone zoomed in about 1.7. Link to comment Share on other sites More sharing options...
Kane Posted November 25, 2019 Share Posted November 25, 2019 The "tire track" is likely an impression of a branching bryozoan. There is no crinoid Archimedes "screw" in any of these pieces (Archimedes is a genus of bryozoan, not crinoid, and would not appear in Devonian-aged rocks given that their range is from about the Carboniferous to Permian). There are, however, several crinoid segment impressions throughout the third pictured piece. 2 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Peat Burns Posted November 25, 2019 Share Posted November 25, 2019 This is Mississippian material (probably Coldwater Shale). I can't tell from my phone if the narrow thing below the crinoid mould in photo 1 is an Archimedes bryozoan (too blurry). The oval crinoid columnal in the last photo is Platycrinites. 2 Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 25, 2019 Share Posted November 25, 2019 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Kane Posted November 25, 2019 Share Posted November 25, 2019 9 minutes ago, Peat Burns said: This is Mississippian material (probably Coldwater Shale). I stand corrected. Good eye! ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Peat Burns Posted November 25, 2019 Share Posted November 25, 2019 3 minutes ago, Kane said: I stand corrected. Good eye! Oh, I did not mean to appear to correct you. . Nothing you said was inaccurate. 1 Link to comment Share on other sites More sharing options...
Kane Posted November 25, 2019 Share Posted November 25, 2019 2 minutes ago, Peat Burns said: Oh, I did not mean to appear to correct you. . Nothing you said was inaccurate. I implied that it was Devonian material. -- Occupational hazard of being around so much of it that one sometimes forgets to take off the Devonian-tinted spectacles. 3 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Bob Saunders Posted November 25, 2019 Author Share Posted November 25, 2019 Thanks too all. I wrote it was clay as we have so much here. This is more of a ball not flat gray layers, and came from a farm pond dig. But I am fairly new at this. In another thread a member wrote about cutting away unwanted with a right angle grinder. I do not think it would be good to try to dissolve away the unwanted or non exposed material? Link to comment Share on other sites More sharing options...
Bob Saunders Posted November 25, 2019 Author Share Posted November 25, 2019 should have said from South West Michigan. About 5 miles from the lake shore. about 6 1/2 inches wide x 4 inch high. Link to comment Share on other sites More sharing options...
grandpa Posted November 26, 2019 Share Posted November 26, 2019 The object in the last photo is a bryozoan, I believe. On a note of personal preference, I would not worry about trimming it down. The admixture of the various fossils is what is attractive to me. Matter of personal preference, though. Link to comment Share on other sites More sharing options...
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