gtheo Posted November 29, 2014 Share Posted November 29, 2014 Found on beach in San Francisco. Found in an area where I find mostly bivalve and sand dollar fossils. But this area is also supposed to have terrestrial sediments and fossils (though I have not found any yet). This was found as a rock which came apart into 3 pieces. Inside were these tube shaped things that look vaguely like roots. A couple of those came loose. At first I thought they were roots but they are completely hard and mineralized. What on earth could they be? Link to comment Share on other sites More sharing options...
Cole Posted November 29, 2014 Share Posted November 29, 2014 Strange it is. Resembles bone or egg shell textures but likely an infilled burrow of sorts, such as a crab. Cole~ Knowledge has three degrees-opinion, science, illumination. The means or instrument of the first is sense; of the second, dialectic; of the third, intuition. Plotinus 204 or 205 C.E., Egyptian Philosopher Link to comment Share on other sites More sharing options...
Rockwood Posted November 29, 2014 Share Posted November 29, 2014 It sure has a plant like signature to me. Does the black substance behave like coal ? Link to comment Share on other sites More sharing options...
tmaier Posted November 29, 2014 Share Posted November 29, 2014 It looks like plant material... root... stalk? Notice the parallel fine lines on it. Terrestrial or marine deposit? Looks terrestrial. Link to comment Share on other sites More sharing options...
dirtdauber Posted November 29, 2014 Share Posted November 29, 2014 Looks like filled-in bivalve borings (Teredolites-like) in lignified wood. Link to comment Share on other sites More sharing options...
Auspex Posted November 29, 2014 Share Posted November 29, 2014 One more vote for toerdo borings. "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...
jpc Posted November 30, 2014 Share Posted November 30, 2014 Shipworms... Yes, Teredo worm burrows. Link to comment Share on other sites More sharing options...
gtheo Posted December 1, 2014 Author Share Posted December 1, 2014 I took a close up picture of a cross section with a camera at work to try to see more detail. Interesting you can see layers in the tube wall. Link to comment Share on other sites More sharing options...
Auspex Posted December 2, 2014 Share Posted December 2, 2014 That's a good image! "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...
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