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Showing results for tags 'Silica'.
Found 14 results
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Crinoid calyx or echinoid? Found in gravel with Ordovician-Devonian fossils. About 2cm across at the widest point. Druzy coating over the fossil which seems to be an external mould. In orange jasper. Thanks so much!
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Is A Blast Cabinet Required For Outdoor Air Scribing?
Megalodoodle posted a topic in Fossil Preparation
I was wondering if a blast cabinet is required to air scribe fossils outdoors? (As long as one wears the proper PPE and safety equipment of course.) I’m trying to save some on my setup until I gather the rest of the cash needed to buy the blast cabinet and move my prepping indoors. And besides, the cold has never really bothered me anyways. -
Found in landscaping gravel at a gas station on a 6.5 hour drive to Lake Huron for some fossil hunting. This is probably Devonian. Instinct tells me horn coral but it looks rougher than that and lacks visible septa at the top. Bryozoan colony? That’s my next best guess. Thanks! Love you guys.
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Found at work among crinoid, brachiopods, silicified corals as well as a possible cephalopod and some silicified stromatoporoids. Silurian SW Wisconsin. Looks kind of like a cartoon bone in shape
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Good evening everyone depending on where you live. I'm new to rocks and fossils and I wanted to see if anyone knew what this strange rock formation may be. I live in Central Michigan where the rock was found. Attached images. Thank you much!
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Found these in alluvial sediments on the Eastern Shore of Maryland. They are silica but very odd shapes, almost look like teeth. Anyone have any idea what these are? Are they fossils or just oddly formed silica?
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Hey everyone! Happy to finally be making another entry. Over the last couple of weeks I've been reading Richard Fortey's "Trilobite" and thus itching to get back into the field and see some for myself. Driving from New York to Chicago I decided to make a pit stop at Ohio's Paulding Community Fossil Garden and try my luck at finding some eldredgeops fossils. Here's what the garden looks like when you arrive: You're basically wading through fossils step after step. Here's the best of what I found, excluding some nice surface-collected brachiopods I've been handing out to friends here in Chicago. I have a few questions about what I've found, if anybody could give me their input it would be very much appreciated!! A lot of little bits. Crushed Eldredgeops rana cephalon about 1.75" wide. What I assume is a juvenile Eldredgeops rana? Size is about that of a dime. Tried to get to the surrounding shale using a pin vise but yielded scarce results. I'd be really grateful for any suggestions from more experienced preppers! Small, nickel sized brachiopod with something that looks to be stuck onto it! Anybody encounter this before?? I would attempt to prep off some of this muck but I don't want to risk damaging anything. Is a pin vise enough? A brush and some sort of solution maybe? Thanks for looking! I'm in Chicago as I write this, and just this morning paid a visit to the legendary Dave's Down To Earth Rock Shop in Evanston. There are walls littered with incredible stones, ancient tools and fossils. Everywhere. Imagine my surprise when encountering a familiar face.
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I have found this coiled cephlapod in Pennsylvanian age limestone in Missouri. I believe it to either be a temnocheilus or cooperoceras. I was wondering if there is anyway to tell if this fossil was silica. And if it was could it be prepped by using acetic acid. TIA!
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Hello, I have many crinoid columnals that I collected in gravel (I suppose it was river/creek gravel collected and sold by a "sand and gravel" company) in Illinois many years ago. I have two questions that may be obvious to more seasoned fossil hunters/students. 1) Exactly how did the crinoids actually grow, meaning, how did the stems' diameter expand horizontally in size as time went on, since the stems were mostly composed of hard calcium carbonate/lime. In other words, it seems that once they are "hardened" or "frozen" into a certain size, how can they get bigger? Was there growth tissue on the OUTSIDE of the stem that kept adding on calcium to the inside, like tree trunks creating wood and bark? (I can understand the growth of whorled type seashells, but I can't get this through my head.) 2) Many of the columnal discs/segments I have found are virtually solid silica, some with a glossy almost pearly luster, I suppose would be classified as flint, chert or chalcedony. I assume from what I've read that this is from replacement of the original calcium with silica over a long period of time. This may seem simple-minded or thinking too deeply, but do researchers claim to understand how the silica could actually have "moved" or migrated into the spaces where the calcium used to be? I can't visualize how this would be possible. Like, one molecule at a time gradually moves through solid rock? Does anyone understand why this seems so hard for me to visualize? Or is this believed to occur because the original calcium actually changes it's molecular characteristics without moving? Any input or comments would be greatly appreciated!
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I picked this up today. I think its a silica (beekite ?) replacement of an algae formation or am I imagining it? Opinions appreciated. Btw its from a little Brallier Formation outcrop near my house.
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I have a mostly complete trilobite that I found this summer at Paulding, Ohio (SIlica Fm, Devonian) which I had assumed was a Pseudodechenella lucasensis, partly because it looks like one and that was the only species of Pseudodechenella that I was familiar with from the Silica (granted, I'm no expert, I've just done some reading). But in looking at this specimen a bit closer and reading a few of the articles, particularly Stumm's 1965 description of the species, I'm having some doubt on the ID and want to solicit the opinion of the Forum. I know there are several Devonian trilobite enthusiasts out there and I would appreciate your thoughts. The primary feature that has me questioning the ID is the lack of a medial groove on the brim of the cephalon which according to Stumm is supposed to be one of the diagnostic features. I don't see one on this specimen, but could that be a matter of preservation, growth stage, or just variability within the species? I have seen that P. alpenensis is also found in the Silica Fm. but that appears to have a much wider brim that what this specimen has (about 1mm wide). There are plenty of other species of Pseudodechenella from other areas of the same age and I have looked at lots of pictures, but not picked an obvious match. Stumm made a comparison to P. rowi, but I am not aware of this species being found in the Silica Fm. I am working on gathering the descriptions of these various species so I can see if that helps me, but I thought I'd see what some of you thought. Any ideas are welcome, thanks. The scale is mm's, it is about 19mm long.
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From the album: Northern's inverts
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Hi, I found this neat little thing near the Naugatuck, Connecticut river that recently flooded and receded from spring storms. Do you think it is a fulgurite, or something more "fossily"? I'll be waiting for your eminent opinions!
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Went to Toledo this weekend to do some fishing in the Maumee River, (river was at near flood stage) Oh, well. Since we couldn't fish we went to the Fossil Park off Centennial Road in Sylvania, OH. 2 for 2 in the bad luck area. You can not use ANY type of digging tools except your hands and maybe a rock you find laying around. If you are familiar with the Silica formation the clay pretty much turns to rock or becomes so sticky you can't dig it. Plenty of piles of clay but no real way to work them. I found a couple of brachs but nothing else. I don't recommend the park for collecting unless you can find out when they deliver new material and get there that day.
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