Llun: 1
Nant Wern Ddu. Upper Course, rocks, plants, feathers. Flows down to Llwyn On - east side of Cwm Taf Reservoir. November 1971

Ripple marks on ORS boulder, Nant Wern Ddu. 1971

Dyddiad: 1971

Llun: 2
Nant Wern Ddu. Upper Course, rocks, plants, feathers. Flows down to Llwyn On - east side of Cwm Taf Reservoir. November 1971

Split river boulder showing core of sparkling mica in dark ORS. Nant Wern Ddu, Brecon Beacons.

Llun: 3
Nant Wern Ddu. Upper Course, rocks, plants, feathers. Flows down to Llwyn On - east side of Cwm Taf Reservoir. November 1971

Sharp blocky cleavage of sandstone. Nant Wern Ddu side.

Llun: 4
Nant Wern Ddu. Upper Course, rocks, plants, feathers. Flows down to Llwyn On - east side of Cwm Taf Reservoir. November 1971

Nant Wern Ddu. Stream bed of sandstone, wall shale below Llysiog. 1/7/1971 Plant colonisation of shales easier as more cracks

Dyddiad: 01/07/1971