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traveltip1

Geodized fossils from the Mississippian of southern Indiana

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traveltip1

I found these several geodized Mississippian marine fossils in southern Indiana. They may not all be hollow with quartz crystals inside, but many are.

The fossils usually balloon in size in the geode-forming process. 

Here's 2 sides of a crinoid calyx...

IMG_20200812_090020.jpg

IMG_20200812_085927.jpg

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traveltip1

And here's a gastropod next to modern shell. You can just make out the whorls on the high spire of the fossil.

IMG_20200911_085926.jpg

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traveltip1

Here's a crinoid....

IMG_20200921_120708.jpg

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traveltip1

I think this is a crinoid....

IMG_20200921_120806.jpg

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Coco

Hi,

 

1 hour ago, traveltip1 said:

I found these several geodized Mississippian marine fossils in southern Indiana. They may not all be hollow with quartz crystals inside, but many are.

The fossils usually balloon in size in the geode-forming process. 

Here's 2 sides of a crinoid calyx...

IMG_20200812_090020.jpg

IMG_20200812_085927.jpg

@fifbrindacier do you know the quartz geods from Doazit in 40 ? The first photo in this post reminds me of the quartz geodes over there. I never assumed that they could actually be fossils at the base. What do you think about that ? Do you know anything about their were formed (we find them in the fields ...).

 

Interesting, traveltip1.

 

 

Coco

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Jackson g
1 hour ago, traveltip1 said:

Here's a crinoid....

IMG_20200921_120708.jpg

:wub::wub::wub:

 

Awesome crinoids! I have some "geodized" crinoids I've found here in my area, they are much smaller in comparison though. I say geodized in quotations because mine are steinkerns of the calyx, that sometimes contain either druzy or butroidal quartz inside the casts.

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fifbrindacier
3 hours ago, Coco said:

Hi,

 

@fifbrindacier do you know the quartz geods from Doazit in 40 ? The first photo in this post reminds me of the quartz geodes over there. I never assumed that they could actually be fossils at the base. What do you think about that ? Do you know anything about their were formed (we find them in the fields ...).

 

Interesting, traveltip1.

 

 

Coco

You're perfectly right coco, the geods of Doazit i have have exactly the same look than in the first pic.

I can see here a gastropod on the second pic, i'm not sure about the crinoids and bivalve identifications but geodised fossils can't be ruled out.

They are Chalcedony : it's a specific organization crystals of quartz with the transformation of silice into dioxydes of silicium.

In Doazit they start from nodules of silex. There is no fossil in that place, but, silicium is an important composant in some fossils. I particularly think about sponges.

 

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fifbrindacier

Here are geods of Doazit :

1)

IMG_20200922_092304.thumb.jpg.c1161a3118dfd927d3ab58e4f7e791d4.jpgIMG_20200922_092344.thumb.jpg.cedd3920044ac3f064d8f451cf01dc24.jpg

 

2)

IMG_20200922_092423.thumb.jpg.ec435de976cff6d1d2f0a212388b2c4e.jpg

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Planko

What great finds. Congrats!

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