Geoconservation Day: Dudley's Erratic Boulders in the Illey Valley. TBC BCGS Posted on 11 December 2022 by admin11 December 2022 Geoconservation Day: Dudley's Erratic Boulders in the Illey Valley. TBC 14 January Saturday 14 January 2023 (Geoconservation Day): Dudley's Erratic Boulders in the Illey Valley. TBC - details to follow. Map Black Horse Pub, Illey iCal Geoconservation Day: Dudley's Erratic Boulders in the Illey Valley. TBC View full calendar