The sandstone top supports short cropped acidic grassland
with clumps of gorse and plants such as cranebill, parsley-piert and bird's-foot
trefoil.
To the north, the ridge of the Bluestone Heath (part of the boundary of
the Chalk Wolds) can just be seen in the far distance. Nearer at hand the
chalk has been stripped away by glacial action leaving the Spilsby Sandstone
exposed. In the valley bottoms the Kimmeridge Clay has been exposed and
is covered in a layer of till, left behind by the retreating ice about 10,000
years ago.
The unusual green Spilsby sandstone has been used extensively in the construction
of many of the older Churches in the area. These include both Somersby and
Bag Enderby churches where Tennyson's father (Dr. George Clayton Tennyson)
was rector for some 25 years. Much of the stone was worked in quarries in
the neighbouring parishes of Holbeck and Harrington.
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