Geoscience Reference
In-Depth Information
Glossary
Amstelian former term named after the small Dutch river Amstel marine beds of
this Pliocene stage were first discovered in a borehole near Amsterdam
Argillaceous term applied to rocks which comprise grain-sized sediments less
than 0.0625 mm (0.0025 in) in diameter; they include over 50 % of sedimentary
rocks with most having substantial clay mineral content
Boulder-clay fine-grained glacial deposit formed by the grinding action of ice
over a land surface
Butleyan Crag the Red Crag of the Butley region of Suffolk
Cannon-shot gravel deposit comprising bands of large nodules of hard, dark
grey, argillaceous gritstone
Casterlien Pliocene sandstone deposit found in Belgium
Chillesford Crag deposit of the Icenian Crag beds
Contorted drift glacial deposit in East Anglian cliffs especially near Cromer;
former ice sheet movements resulted in the enclosed deposits being strongly
folded and when the ice eventually melted this material remained deformed
in situ
Coralline Crag Pliocene deposit lowest of the East Anglian Crags
Crag Sea great gulf between Britain and mainland Europe during the Pliocene
Crags of East Anglia shelly sandstone strata divided stratigraphical (from early
to late) into the Coralline Crag, Red Crag and Norwich Crag
Cretaceous third and most recent of the three Periods comprising the Mesozoic
Era (146-65.5 million years ago)
Cromer Forest Beds Series estuarine and fresh-water deposits found in the
Norfolk coast inferred past climatic conditions varied from cold to temperate
Cromer Till boulder-clay deposit containing Scandinavian erratics
 
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