Rocking in the big City #1 EarthCache
Rocking in the big City #1
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A remnant of the Ice Age from the Lake District right here in the heart of the City..! but what is it and how did it get here ??
This rock or 'glacial erratic' as it should be known, is located in Ardwick Green Park, a late 18th century park in Manchester, the rock was thought to have been dug out when the park had an ornamental pond within it, (now long gone)
But how did it get here ?
During the early Devensian period, ice formed only in Cumbria. By 22,000 BP the northwest of England was covered by ice
emanating from Scotland and the Lake District. The ice sheet was warmbased, with subglacial water movement within
tunnel valleys. As the climate warmed the ice receded northwards, leaving moraines and stagnant ice features. During the
later stages of recession, subglacial water began to move through the thick till bed, and deformation of this sediment into
drumlins occurred. This process was aided by the marine inundation of the Irish Sea basin, forming a tidewater glacier
margin, and causing rapid drawdown and calving of icebergs. After the main ice sheet had disintegrated, a cold snap led
to the reformation of ice in the Pennines and Lake District.
Rocks such as this one were transported from the Lake District areas within the huge moving masses of ice and were deposited wherever the icebergs came to rest before finally melting.
Evidence of the last glaciation to affect Northwest England would suggest this erratic was probably deposited in this area between 25,000 and 19,000 years ago, most peope walk right by this rock without giving it a second glance.
You have now learned a little about the Earth and it's amazing past, and how rocks like these come to be in the middle of a bustling cityscape !
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1. What colour is the rock ?
2. what height and width is the rock ?
3. Please state what type of stone this is -
4. Please post a photograph on your log with you or your GPSR stood with the rock.
The rock is easy to locate and access is to it is wheelchair friendly.
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Additional Hints
(Decrypt)
Lbh znl cbffvoyl svaq n terl glcr bs guvf ebpx ba lbhe ebbs...