Rt. 36 Roadcut of the

Hwanggangri Formation

 

A nice exposure of Hwanggangri Formation diamictite occurs in a Rt. 36 roadcut about 2-3 km northeast of the Rt. 36-Rt. 531 intersection, near the southwestern corner of Lake Chungju.  GPS of cut: 36° 55.010' North, 128° 01.891' East.

 

This is the same unit that was exposed along the Hwangcheon River in Woraksan National Park.  Unlike the Hwangcheon River exposures, the diamictites at the Rt. 36 cut are not silicified.  We've got diamictites (“pebbly mudstones”) of the Hwanggangri Formation (undetermined age) having a very dark siliciclastic mudstone/phyllite matrix.  It was raining during this visit, but the pic below still shows well a conspicuous clast in dark matrix.  The clasts seen here are usually limestones.

 

 


 

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