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Vnaz50

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Rocks, no fossils. 

 

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My advice is that you look into the bedrock geology of San Antonio, possibly through the USGS (US Geological Survey) to get a better sense of what is available around you. This will help direct your efforts and hopefully lead to fossil goodness!

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4 minutes ago, Fossildude19 said:

Rocks, no fossils. 

 

I am ignorant to this and trying to learn as I find things. Would rock wear in socket type position?

image.jpg

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They can. It could also be a vug, or a concretion setting. The concretion is removed or dissolved, leaving the cavity.

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3 minutes ago, Rockwood said:

Don't these look like faint shell mold fossils ?

 

Not to me.

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5 minutes ago, Ludwigia said:

Not to me.

I do know that some of these will dissolve when it comes out of water, and into the air, very rapidly. Almost like it’s in pixels.

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3 minutes ago, Vnaz50 said:

I do know that some of these will dissolve when it comes out of water, and into the air, very rapidly. Almost like it’s in pixels.

Fossil shells will not dissolve in air or being exposed to water (unless for a long period of time). The composition of fossil shells usually makes them more resistant to dissolution if they are composed of calcium carbonate.

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1 hour ago, Kane said:

Fossil shells will not dissolve in air or being exposed to water (unless for a long period of time). The composition of fossil shells usually makes them more resistant to dissolution if they are composed of calcium carbonate.

If the carbonate component of a fossil shell was already dissolved out the less soluble replacement minerals would wash away easily.

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5 minutes ago, Rockwood said:

If the carbonate component of a fossil shell was already dissolved out the less soluble replacement minerals would wash away easily.

Yes, but usually the matrix erodes first. If we're talking steinkerns, then the whole thing dissolves equally. Thanks. 

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17 minutes ago, Rockwood said:

:Smiling:

Fairly moot in this case. 

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