John Altringham on Nostr: Yesterday - sketching as I listened to the rollercoaster final day of the last Ashes ...

Yesterday - sketching as I listened to the rollercoaster final day of the last Ashes test match:
A lichen-covered Silurian siltstone "erratic" boulder carried and dumped by an ice age glacier on Carboniferous limestone. The boulder has protected the underlying hard but soluble limestone from erosion, leaving it on a pedestal. Norber, Yorkshire Dales, UK.

Some of these erratics are candidates for an engraving.

#watercolour #geology #RockArt