New Members q34e31p418 Posted August 16 New Members Share Posted August 16 Looking for ideas on these objects from similar formations. Size range: rice grain to ~4cm Shape: spindle, cylinder, kidney, spherical, flattened Type of deposit: associated with stromatolites, ostracods, algae Environment: possibly estuarine Possible ID: reminds me of various types of forams Location: Murray Basin, South Australia Link to comment Share on other sites More sharing options...
ted coulianos Posted August 17 Share Posted August 17 looks like oolitic limestone; the little 'spherules' are called "oolites"; here's a reference, hope this helps: https://en.wikipedia.org/wiki/Oolite 1 1 Link to comment Share on other sites More sharing options...
New Members q34e31p418 Posted August 18 Author New Members Share Posted August 18 Yes, I agree that some of them are similar, but I haven't seen any of the odd shapes in oolite from anywhere. Link to comment Share on other sites More sharing options...
Ludwigia Posted August 18 Share Posted August 18 The second and third to last photos definitely show ooids in my opinion. Can't say what the other shapes are though. They just look like oddly shaped pebbles to me rather than forams, since I'm not seeing any typical shapes or structures. But maybe I'm wrong. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
westcoast Posted August 18 Share Posted August 18 The non-sperical ones may be oncoids. If you break one open you should see distinct layering. 3 Link to comment Share on other sites More sharing options...
minnbuckeye Posted August 18 Share Posted August 18 Out of curiosity, where do stromatolites fit in? Link to comment Share on other sites More sharing options...
New Members q34e31p418 Posted August 23 Author New Members Share Posted August 23 Out of curiosity, where do stromatolites fit in? They are part of a stromatolite reef responding to volcanic activity at that time. Never seen before or since. Somewhere this side of 5 million years. Link to comment Share on other sites More sharing options...
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