Innovea Technologies

Innovea Technologies

Hill Country

Hill Country Scientific

Crabtree Creek

Raleigh Bedrock Outcrop

Becrock Outcrop Photograph facing South - photo by J. Sents, 2012

The Raleigh, North Carolina area is a peneplain. The area has been devoid of any mountain building events for quite some time so the land surface has very low relief. As a result, outcrops of exposed metamorphic bedrock across the Piedmont physiographic province are few and far between. Additionally, bedrock may be covered by a literal veneer of dense soil and/or saprolite which conceals the bedrock below by mere inches.

But fear not!  I am a trained geologist and have become adept at finding these obscure bedrock outcrops.  So for reference, and in case anyone wants to go and visit, lets start with a map that I cobbed together.

Site Location of Bedrock Outcrop along US-401 South, Raleigh, North Carolina – photo by J. Sents, 2012

I used the Wake County iMAPS GIS [Beta] for the base layers used to create the map above.  The location presents itself as an unpaved, unmarked parking lot.  Along the southern edge of the lot, a stand of trees and bushes conceals the exposed bedrock.  So a few days after the initial identification of this site, I made first contact with my camera and compass.

Bedrock Outcrop Photograph facing South – photo . . . → Read More: Raleigh Bedrock Outcrop

So No Hurricane Earl

To be honest, I was sort of hoping for more of an impact this far inland from Hurricane Earl. Maybe not as bad as Fran or Hugo, but something. The folks that live out on the Outer Banks probably took some damage but they’re used to and can handle quite a bit way out there.

Oh well. The 2010 Atlantic Hurricane Season still has quite a bit of life. I really wanted to get some swollen streams around here to examine something with you. We have this type of regolith, or highly weathered bedrock, that rests right above the actual bedrock surface in the Piedmont of North Carolina. Sometimes referred to as Partially Weathered Rock, or more commonly Saprolite, I wanted to evaluate if this material shows evidence of weathering and erosion, or if it tends to weather in place, in the stream banks anyhow.

I’ll need some water chugging down these streams for that. Unfortunately, the only times this summer we’ve had the types of heavy rainfall required have been very late at night. Fret not. There’s plenty of Hurricane Season left. Hopefully, we get some good rain on a day I can run over to a stream near . . . → Read More: So No Hurricane Earl