Identification needed for my latest finds

[Mercydarko13]

I would appreciate some help identifying some of my latest finds. Since I am in Southern Indiana, I know many of my finds are silicified or geodized and I kind of know what some of them are but I want to be sure. I apologize if this post seems to be a bombardment of pictures that I am asking help identifying but I didn't want to post too many separate posts. Hopefully I've correctly uploaded pictures & if I am doing anything incorrectly please give me advise.  First are what look to be turtle shells or are they  just geodes moonlighting as turtle shells? 

 

 

[Mercydarko13]

My second identification inquire... Is this a Joint bone? I really appreciate any answers ahead of time and will post a couple more Id like input on tomorrow on this post . Thanks

 

[Lone Hunter]

I can see why you think turtle shell, esp the larger one, it has the shape but it's not shell. Have a feeling chert might be involved though. The second one is not bone, it has a suggestive shape also but there are no bone characteristics. Someone much better at this will hopefully explain what kind of rocks you have.

[Rockwood]

4 hours ago, Mercydarko13 said:

First are what look to be turtle shells or are they  just geodes moonlighting as turtle shells?

I'm afraid it will take an experienced eye to pull these from the ranks of chert nodule. If it indeed can be done.

4 hours ago, Mercydarko13 said:

Is this a Joint bone?

Simply no. Chert nodule is my thought again.

[Fossildude19]

The second one looks like either limestone or sandstone. 

First is definitely chert. 

No fossils here, I'm afraid. 

[Rockwood]

10 minutes ago, Fossildude19 said:

like either limestone or sandstone. 

Like, a geologist would probably either pickle it or chew it ?

[FossilDAWG]

2 hours ago, Rockwood said:

Like, a geologist would probably either pickle it or chew it ?

Or lick it.

 

Don

[JimB88]

the first one could be geodes..try cracking them open. The geology of southern Indiana indicates the strata there is too old for turtles.

Edited May 28, 2021 by JimB88

[Rockwood]

1 hour ago, FossilDAWG said:

Or lick it.

 

Don

Them too huh ? 

[ClearLake]

I’m also thinking the first ones could be geodes, they look similar to geodes that are relatively common in parts of southern Indiana, although I think Jasper is a bit further south than most are found. I’d also take a whack at one of them and see the inside, if they are a geode sometimes they can be quite nice looking. 

[Harry Pristis]

 These nodules are produced in Mississippian limestones in Indiana. These limestones extend over a broad swath of the state to the Ohio River border with Kentucky. 

Organic material deposited on the sea bottom often became a focus for the accumulation of silica dioxide (SiO2) through a complicated geochemical process. As more and more SiO2 came out of solution at the organic focus, the geode "shell" of quartz formed and grew in size. Often the center of this shell remained unfilled. In most cases, the original focus of the geode growth - a fossil - is obscured; but, occasionally the fossil itself, or a pseudomorph, can be seen.

 

[Mercydarko13]

Yes they'd be geodes then. I find geodes in abundance here even though Ive been told by a few people I live too far south and the Lake Monroe area is where the geodes are found. Well, anything is possible because here's some Dubois county, too far south Geodes that I've found just this spring. 

 

  

[Mercydarko13]

Here is another identification inquiry with accompanying pictures. Are the following geodized Brachiopods?

[Mercydarko13]

Then there's this ... It looks like poo in every way but I am learning that looks can be deceiving. It has some plant or insect in it And on both sides.

 

  

[Mercydarko13]

And my last ones in this identification post...

 

[Rockwood]

1 hour ago, Mercydarko13 said:

Geodes that I've found just this spring.

Caution ! Fossils can be addictive. 

[Lone Hunter]

Is that the true color of the rocks?  Could you try taking a picture on a white surface with no flash. To have some contrasting colors would be helpful. I don't see any brachiopods but the fourth rock looks like it has crinoid stems. Don't think next one is coprolite but is has a fossil in it that I'm not sure about.  I am wondering if the next one is coprolite and hopefully someone smarter than me will tell you. Lastly, I commend you on not asking if the last one is an egg, I think s lot of people would have. Not that I know what it is, guessing a concretion. 

[Wrangellian]

Direct sunlight is best for photos, unless you can adjust the white balance for indoor incandescent or fluorescent lighting (and even then)...

I find the flash can help give a more accurate color but you are limited in the lighting angles there.

 

That last item has the look of a crinoid calyx, but I'm no expert in that area. 

[Coco]

Hi,

 

On 5/29/2021 at 7:22 AM, Mercydarko13 said:

Yes they'd be geodes then.

A geode is a hollow "ball" that contains crystals. Is this really the case ?

 

Coco

[Rockwood]

1 hour ago, Coco said:

Hi,

 

A geode is a hollow "ball" that contains crystals. Is this really the case ?

 

Coco

Ever tried to catch the subway in a major American city during rush hour ? 

It may be just tightly packed.

[Coco]

Sorry, but I don’t understand what you mean (like from time to time)...

 

Coco

[Lone Hunter]

I think he meant the hollow space was filled.  These look like half of a ball and with no crystals it's really not a geode is it?

[Harry Pristis]

  I've cracked open many of these "accretions" when I lived in Indiana.  You can consider many of these as "former geodes," if you like.  The silicate crystals (typical) which line the cavity may continue to develop until they massively fill the chamber. 

  Many of the small accretions (like Mercydarko's) don't develop a significant cavity, and they may appear massive.  But, rather than "accretions" or "former geodes," I suggest a convention where we call these Mississippian geological phenomena "GEODES."

[Rockwood]

The crystals behave more like the rail car when a busy stop is coming up is my vision, as it has been described. The void just provides a little elbow room to make it possible.

I'm imagining it as Harry posting the answer. I think. 

[Coco]

Definition of Wikipedia : Une géode est une cavité rocheuse tapissée de cristaux (souvent automorphes) et d'autres matières minérales. Ce n'est pas vraiment un minéral mais une composition de formations magmatiques, cristallines et/ou sédimentaires. Largement répandues à travers toute la planète, les géodes sont la source principale des minéraux des collections minéralogiques car c'est un milieu optimal pour diverses formations minérales.

 

Translation : A geode is a rock cavity lined with crystals (often automorphic) and other mineral materials. It is not really a mineral but a composition of magmatic, crystalline and/or sedimentary formations. Widely distributed throughout the planet, geodes are the main source of minerals in mineralogical collections because they are an optimal environment for various mineral formations.

 

Coco