Search the Community
Showing results for tags 'geode fossil'.
-
Hardouinia mortonis "Geode" with internal crystallization
Echinoid Express posted a gallery image in Member Collections
From the album: My Echinoid Collection
Hardouinia mortonis Peedee Formation Maastrichtian Age, Late Cretaceous (~70 Ma) Holden Beach, Brunswick County, North Carolina, USA Self collected in September, 2023 A bit of an unusual find, this Hardouinia mortonis specimen had a significant amount of crystallization occur within the internal cavity, where the sediment settled and left a pocket. It's not too terribly uncommon to find these specimens with a layer fine crystals in these pockets, and I have found a few broken ones with such layers from the area. However, this one stood out because it was mostly intact, and the crystals began to form in what was likely a small crack, which ended up splitting it open over time as they grew. I have been calling it my "geode" echinoid. I am not sure what kind of crystals they are. They are usually very small and grey, forming a "film" over the walls of their cavity. I think it's either a type of quartz, or a type of calcium carbonate. The entire test of this one seems to have a slight degree of mineral replacement to it, mostly noticeable on the oral surface (there is some dense crystal filling the peristome and the features surrounding it).-
- beach find
- cassiduloid
- (and 9 more)
-
I simply have no clue what any of these are. Part of the collection I purchased at a Florida estate sale. Very curious about #1 in particular but any help is appreciated.
- 4 replies
-
- florida
- geode fossil
-
(and 2 more)
Tagged with:
-
I found what I think is a geode in a small stream here in Vigo County, Indiana. Brought it home and discovered all these unusual circular patterns along the narrower edges. Looks like urchin but I have not been able to find a similar type online. It does not feel hollow. Has anyone seen a similar surface patter on another specimen?
- 5 replies
-
- geode fossil
- paleozoic
-
(and 1 more)
Tagged with:
-
I found these super cool fossils turned geode today. Any idea what kind of crystals they might be? I was thinking calcite or quartz. Much appreciated. (Edit: Doesn’t react to vinegar, so silica or clear quartz maybe?)
- 10 replies
-
- geode
- geode fossil
-
(and 3 more)
Tagged with: