Northwest Indiana Creek Find

[Cadymarsh]

 

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[Brian T. Booth]

Hey guys, new here. I'm posting a pic of a rock found in a Northwest indiana creek bed. Valparaiso Porter County area (Valparaiso Moraine), Devonian Age. I have found a lot of small fossil fragments (crinoids) and coral fossils in this creek. I have also found other oddities that could be common indian artifacts or nothing at all. The typical Indiana rocks & minerals are represented in this creek, Quartzite, Limestone, Chalcedony, Chert, etc. I found this large rock & I was hoping someone could help identify it. Sandy & gritty feeling, with small sparkles. It has raised rings around the entire piece. <img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=862303"/><img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=862304"/><img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=862305"/>

Welcome to treasure net. What you have is a rock with a mineral within it that is less susceptible to weathering than the rest of the rock. Over time the rock will weather away and leave the mineral behind. I can't tell exactly what type of rock you have. But I think the mineral that is within the rock is quartz. The small sparkles that you are describing could be small grains of sand, you said it feels grainy. Or it could be little pieces of mica. Possibly muscovite.

 

[rock]

It looks to be a sandstone concentration or either limestone to me. I find some with that quartz line running through them at times near water.

 

[rock]

Might mot be on this section of the forum as a solved button.