21. The mystery started decades ago with some unusual glacial deposits . 22. Jurassic and Cretaceous clays are overlaid by Quaternary glacial deposits of chalky boulder clay. 23. The castle was originally a timber and earth fortification, built on modified glacial deposit . 24. Exposures of ancient glacial deposits are numerous in these areas. 25. The angular, coarse-grained, poor-sorted glacial deposit , called tillite, was deposited. 26. The rock is covered with glacial deposits over a large part of the territory. 27. The surrounding waters moderate the temperature, while glacial deposits provide good grape-growing soil conditions. 28. Unconsolidated glacial deposits along the riverbank at Broughton have caused several landslides along the riverbank. 29. Glacial deposits that take the shape of hills or mounds are called " kames ".30. Local wildlife preserved in glacial deposits include close relatives of modern clams, crustaceans, and snails.
