perched block

perched block

[′pərcht ′bläk]
(geology)
A large, detached rock fragment presumed to have been transported and deposited by a glacier, and perched in a conspicuous and precarious position on the side of a hill. Also known as balanced rock; perched boulder; perched rock.
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References in periodicals archive ?
The decision to demolish the flats - the second block to be knocked down after the precariously perched Block E in October 2012 - was taken as engineers and insurers did not feel it was worth the risk to save them.
Rubble is all that remains of flood flats
FLATS TO BE DEMOLISHED NEXT WEEK HOUSING developers have set a date to demolish a precariously perched block of flats in Newburn.
Heavy rain brings river flood alerts; But warmer days ahead next week

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