Well the Lake Texoma area looks like a beautiful place to spend a
lifetime hunting for rocks!
From what little I've read it has a pretty complicated geology with
a lot of folding and uplifting having taken place. The cause of many
of the episodes are still unsatisfactorily explained. But they have
exposed several different sandstone and limestone sedimentary
layers that provide ample fossil collecting among lots of other things.
Here's a good link to a pdf about the area but I didn't see anything
that describes what you've got there;
www.ogs.ou.edu/pubsscanned/openfile/OF1_97.pdfI don't know the geology of the area so the first thing I would try
to do is decide if this is an older basement igneous rock or some
sort of sedimentary sandstone.
Great pics, BTW, but I don't see a cavity in the rock, so it's not a
geode. Geodes have a hollow area.
One of the interesting things to me are the little spheres of the
grey rock in the white middle matrix. How'd they get there?
I'm leaning toward a highly weathered igneous basement rock
that is well on the way to morphing to something other than what
it started out as.
And is that rusty iron limonite/goethite coating leeching out of the
rock or an accumulation precipitated onto the exterior of the rock?
Oh well, now I'm just thinking aloud here.
More questions than answers, sorry.
Good luck,
Joe
