The Geology of Hubbard’s Hills of Lincolnshire
Around 450,000 years ago a severe cold phase known as the Anglian glaciation led to an ice sheet spreading across East Anglia and most of Lincolnshire. All but the highest parts of the Wolds lay under a thick sheet of ice grinding slowly south, eroding massive quantities of chalk and other rocks and depositing what is known as boulder clay.
Then during the subsequent Ipswichian glacial period, a rising sea filled the eastern part of Lincolnshire, forming a sea cliff along the eastern edge of the Wolds. Next
Hubbards Hills, Louth’s 40m deep, steep sided chalk valley was originally cut by torrents of glacial meltwater during the last ice age about 40,000 years ago. The ice had dammed up the Hallington Valley to create a lake which spilled over into the Welton Valley as a waterfall. As this was cut back, so Hubbards Hills was formed. Such was the volume of water that this process took two to three hundred years.
Typical chalk streams are shallow and narrow with a gravel bed. The clear mineral rich water is relatively warm and ice free in winter and cool and oxygen rich in the summer, attracting a wide diversity of plants and animals.
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