Deep River Basin: Triassic Sedimentary Rocks -

Representative Rock Types

 

Conglomerates with interlayered conglomeratic mudstone exposed in railroad cut in Morrisville, NC. Durham sub-basin of Deep River Basin Triassic conglomerate

Conglomerates exposed along shore of Falls Lake (Raleigh/Durham area) within the Durham sub-basin of the Deep River Basin.

Clasts are chiefly composed of diorite interpreted to have been sourced from the Beaverdam diorite-gabbro complex exposed to the east.

Conglomerate
Example of Triassic sandstone. Photograph from outcrop on New Hope Creek near Erwin Road in the Durham area. Durham sub-basin, Deep River basin. Sandstone and Conglomerate
Outcrop of interlayered siltstone and sandstone exposed along the shore of Jordan Lake, Durham sub-basin of the Deep River basin.


The Triassic sandstone typically is composed of sand-sized grains of quartz and feldspar with some mica (muscovite and/or biotite).

(Photograph from Martha's Chapel on shore of Jordan Lake.)

Sandstone and siltstone

Outcrop of Triassic siltstone exposed on shore of Jordan Lake in the Durham sub-basin of the Deep River basin.

Siltstones locally contains gray areas that are interpreted by geologists to have been caused by plant roots or burrowing animals. Geologist call these features bioturbation.

(Photograph from Martha's Chapel on shore of Jordan Lake.)

Mudstone
Organic rich shales from the Carbonton, NC area in the Sanford sub-basin of the Deep River basin. Organic shales
Coal from the Carbonton, NC area in the Sanford sub-basin of the Deep River basin. Coal