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Yoldia clay
Marint clay consists of very fine particles deposited in deeper, quieter water (+20m).
Younger Yoldia clay are sea deposits from the late glacial ice sea (Yoldia Sea), as this had the greatest extent and was deepest 14,000 to 13,000 years ago.  The clam Portlandia (formerly called Yoldia) arctica is a guide fossil.

Older Yoldia clay are sea deposits in an ice sea about 40,000 years ago.
Saxicava sand
A sandy sea deposit in shallow water in the Yoldia Sea (late glacial ice sea) during its retreat.  The clam Saxicava arctica is a guide fossil.  The sand is deposited over Yoldia clay.
Melt water sand
Marint sand consists of somewhat coarser particles deposited in shallow water (0 - 20 m), where there is movement (current).  The sand is deposited in a sea (sea basin) where Vendsyssel now lies.  The strata is deposited at the runoff from the large mammoth steppe south of Vendsyssel.  The oblique flakes in Lønstrup Cliff consist of this sand and clay.
Melt water clay
Very fine particles deposited in a sea in deeper water.  The clay is deposited in a sea (sea basin) there where Vendsyssel now lies.  The strata is deposited at the runoff from the large mammoth steppe south of Vendsyssel.  The oblique flakes in Lønstrup Cliff consist of this sand and clay.
Amber stick strata
Amber stick strata can be found on the edge of the beach but also in the cliff itself.  The amber sticks are stumps from old forests.  The sticks have the same specific gravity as amber, therefore the two materials stay together.  If one wants to find amber, one needs to look along the edge of the water with sponge, bottom animals and tar-black amber sticks.
The amber itself is a product of prehistoric forests of pine trees, which produced a special type of resin; which, in the course of 40 to 70 million years, under water and high pressure, petrified and became amber.
 
Vendsyssel Historiske Museum · tlf. 96 24 10 50 · vhm@vhm.dk
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