... fracturing in the summers of 2015 and 2016. The warm-weather timing of all events strongly suggests that thermally-induced environ- mental conditions are responsible for triggering exfoliation. Some of the exfoliation events consisted of rock slabs being thrust ~40 cm into the air in a matter of seconds...

... of a thin bedrock sheet several meters across (Sarpaneva 2014), while total vertical strain of one section of the pop-up was up to 100 mm, and observations following the event indicate a slab of approximately 50 m2 was detached from the underlying bedrock. Long scratch marks (‘striations’) visible...