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

Fall Zone Recon

Yesterday I did a little recon of the Fall Zone.  What is the Fall Zone? On a map it’s a line; however, that’s not entirely accurate as it’s more of a band.  Essentially, it’s the boundary between two distinct regions of bedrock, called physiographic provinces.  At the transition of the two rock types, there is a low rise in the landscape and any rivers that cross the Fall Zone generally contain rapids, riffles, whitewater, and waterfalls.

The Fall Zone from New Jersey to Texas – from CSRA, 2010

The Fall Zone is a pretty big deal.  The whole zone stretches from southern New Jersey to Texas.  In the Southern Atlantic States, the Fall Zone marks the boundary between the metamorphic rocks of the Piedmont Province and the sedimentary rocks of the Coastal Plain.  The Piedmont rocks are more resistant to weathering and erosion compared to the softer Coastal Plain rocks, hence the waterfalls and rapids in the rivers that cross the Fall Zone.

View facing west along US-70 toward Nuese River near Selma, NC – photo by J. Sents

The significance of the Fall Zone goes back to Colonial American time.  The early waves of . . . → Read More: Fall Zone Recon