Sandra Bartocha / Erratic boulder on the shore of the Baltic Sea, Jasmund National Park, Germany, October

Ben Hall / 2020VISION / Dusk over upland moorland landscape, with erratic boulder in foreground, Lake District NP, Cumbria, England, UK, November

Bryan and Cherry Alexander / Shattered glacial erratic resting in a smooth glacially eroded landscape. Blomstrand, Spitsbergen, Svalbard, Norway, June 2008.

Bryan and Cherry Alexander / Glacial erratic resting on the tundra at Blomstrandhalvoya with Purple saxifrage (Saxifraga oppositifolia) flowers nearby. Spitsbergen, Svalbard, Norway, June 2008.

Graham Eaton / A 'glacial erratic' or boulder deposited by retreating ice, outside Cwm Idwal, Snowdonia National Park, Wales, January 2009

John Waters / Glacial erratic boulder, in limestone landscape, The Burren, Country Clare, Republic of Ireland.

Niall Benvie / Rocks left by glacier movement - glacial erratic, in a lake-side bog, May, Songli, Sør-Trøndelag, Norway

Yva Momatiuk & John Eastcott / Glacier receding over golden tundra slope, with grasses, lichen, moss, rocks and erratic boulders, fall morning, Salversen Range, Smaaland Cove, South Georgia Island, Southern Ocean, Antarctic Converg...

Yva Momatiuk & John Eastcott / Blue glacier receding and small tarn or pond, on green and golden tundra slope, with grasses, lichen, moss, rocks and erratic boulders, fall morning, Salversen Range, Smaaland Cove, South Georgia Isla...

Doug Wechsler / Rock left by glacier movement - glacial erratic, Yellowstone National Park, Wyoming, USA

Philippe Clement / Kettle pond and erratic boulder (glacial features) on tundra, Denali NP, Alaska, USA

Philippe Clement / Glacial erratic boulder, remnant of the last ice age, Yellowstone National Park, Wyoming, USA.

Jason Smalley / Erratic boulders on limestone pavement, Yorkshire Dales, above Ingleton, England