Flints Lewes in Val-de-la-Mer
The wall is is the opportunity to examine uninhibitedly various forms that flint Lewes can present.
Flint Lewes corresponds to the "maximum Flint glass" of upper Turonien. They are most developed between marls Bridgewick and marl Lewes (iinterval T7 of Turonien)).
In this interval T7, two types of rocks are rather characteristic in England:
-CChalk Rock, still indicated by "hhardgrounds Lighthouse Down" " in Dover, which corresponds (about) to the isotopic anomaly "Hichwood Event" (ppositive peak d13C);
-FFlints Lewes, silicification generally of dens Thalassinoides.
In the cup of Val-de-la-Mer, Chalk Rock corresponds to the HGs Senneville.
Flint Lewes is especially represented by 4 semi-continuous levels of flint Thalassinoides, very well locatable in cliffs enter The Course Fagnet And Eletot. Their description will be made when we shall reach them in foot of cliff.
These flints diminish in the direction of the Course Fagnet, they develop in the direction of Eletot.
It is a question here of showing the particular aspect of flints being below and over these 4 flints:
Lower horned flints
It is isolated flints, a size of about ten centimeters, showing appendixes or "horns" in all directions. This type of flint is especially present in upper Turonien, but he can exist at other levels (Campanien, for example)). Two hardgrounds cross the coat of horned flints
Superior tubular flints
He appear over semi-continuous flints. Their cylindrical aspect is very clear and they are often hollow with a sinuous wall. They cross the chalk in all directions.
Here, the superior marl Lewes does not exist and a slender hardground replaces her.
Return at the beginning of the excursion