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Showing results for tags 'limonite'.
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 b
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
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.
I_gotta_rock posted a fossil in *Pseudofossils ( Inorganic objects , markings, or impressions that resemble fossils.)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.