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Found 7 results

  1. Isotelus2883

    Weird limonite thing

    Found in spoil piles originating from the Hayward Quarry in Quincy, Massachusetts. Perhaps oxidised limonite burrow? Could the thing I circled be a poorly exposed Paradoxides cranidium? Burrow-like object is 2.2 in. or 5.6 cm. Braintree Argillite.
  2. Lone Hunter

    A few odd Woodbine things

    All of these came from a cliff face on lake Grapevine, no.1 both of these stood out because of rounded shape, plucked from the face of uppermost part of cliff. no.2 there was a thin layer of limonite running length of ledge, all was unremarkable I saw except this piece, thinking impression of plant material? no.3 assuming it's a concretion, thought it was an ammonite when it was cloaked in dirt, found in crevice with some gravels at top of cliff, doesn't look like Woodbine material so stood out, not calcite. Pics are out of order, first one should be last.
  3. Nat006

    Limonite or petrified wood?

    I found these in a forest in Germany. What are they? Petrified wood? Or just a rock/limonite? Thank you.
  4. mbarco

    Ordovician unknown...?

    Upper ordovician, Italy. Scale bar 5mm. Decalcified specimen preserved as the internal and the external mould. So the calcified occupied the space between the two moulds. 1) the only part of the external mould available. I think to see an ornamentation of narrow oblique parallel lines (red arrow). 2-3) two images of the internal mould. 4) an image of the external mould (overturned. Blue coloured) placed upon the internal mould. I think almost in the same position it was before cracking the rock. I had an idea, but the cross-shape at the bottom of the internal mould doesn't match anything in mind
  5. Wrangellian

    Coprolite, or pseudocoprolite?

    I've had this for a while but don't recall where I got it. Someone probably gave it to me - without data as usual. Is it one of those 'pseudocoprolites' from the Miocene Wilkes Formation of Lewis Co, Washington? Or do things like this occur elsewhere? Are there any confirmed coprolites that look like this, from any place? If not a coprolite, what is is composed of - limonite, siderite? @GeschWhat
  6. Heteromorph

    Atco Peculiarity

    In June of 2018, Kieth Minor alerted me to a new apartment complex that was being developed in the middle Atco Formation of North Texas. They were cutting a huge cubic area of rock out of a hillside, piling up multiple large mounds of Atco which seemed to be begging for someone to carefully search out their freshly exposed contents. On the 15th of that month we got to the site, Kieth asked permission of the site foreman for us to carefully take a look around during the crew's work hours, and we made our way into the pit. We were on a mission to save as many ammonites as we could. FIG 1: First impressions.
  7. Limonite is a type of iron-rich mineral found in igneous formations. It was once used as a source of iron ore and in Delaware was mined for the purpose for two centuries. Limonite tends to form with vugs of easily-weathered minerals, including druse quartz, which leave behind gaping holes and slots. It is easy to picture skulls and other bones in these rocks, whether freshly fractured or stream-worn. This one always reminded me of a dragon skull.
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