What is this 1885 rock

[corvette99]

Picture is from a rock supposedly dug out of hillside in about 1885. Hillside appears to be sandstone, is this a sandstone rock? Or basalt? or?

Thx
Doug

 

[Tegan28]

I'd almost say basalt. Given the holes

 

[DizzyDigger]

Picture is from a rock supposedly dug out of hillside in about 1885.
Hillside appears to be sandstone, is this a sandstone rock? Or basalt? or? Thx Doug

I'm not a rock person Doug, but it is a cool looking rock!

Welcome to the site..

 

[fano169]

Isn’t that the type of rock you find ores in ?

 

[corvette99]

Isn’t that the type of rock you find ores in ?

Thanks to those who replied about my request to identify the rock .... FYI, I subsequently sent the rock photo to the Geology Department at our local University of Wisconsin campus, and a Professor identified it as an "iron concretion" follows:

"The rock you have photographed is an iron concretion from the Mt. Simon Formation. Most of the rock in the area is the lower portion of the Eau Claire Formation, which is just above the Mt. Simon Formation. The iron concretions form from Fe-bearing water moving in the groundwater system becoming oxidized and depositing iron oxide (Fe2O3). They are very common throughout the Eau Claire area within the Mt. Simon Formation."

Mystery solved.
Doug

 

[EQ8]

Looks like a set of keys to me.

 

[Plug N Play]

I'm not seeing a concretion, nor does it appear to contain concretions. Also, that doesn't account for the chalcedony agate material. Might want to check out coldwater agates ?

Coldwater agates did not form under volcanic processes, but instead formed within the limestone and dolomite strata of marine origin. Like volcanic-origin agates, Coldwater Agates formed from silica gels that lined pockets and seams within the bedrock. These agates are typically less colorful, with banded lines of grey and white chalcedony.

 

[ANTIQUARIAN]

Welcome to Tnet from Toronto Doug!

You may also want to post your question here... Geological Forums

Dave