Could someone please help me with this german text?

Question

Ablagerungen von sehr dichtem sand, kies oder sehr steifen Ton, mit einer Dicke van mindestens einigen zehn Meten, gekennzeichnet durch einen allmählichen Anstieg der mechanischen Eigenschaffen mit der Trefe

Answer 1

Trefe is comming from Jiddish and means the opposite of koscher = Verunreinigung = impurity. I have only read this expression in conjunction with geology.

Greetings from Hamburg, Germany

Heinz

Answer 2

Deposits of very close sand, gravel or very rigid clay, with a thickness of at least tens of metres, characterized by a gradual rise of it's natural properties with the ....Trefe(?)

Answer 3

german is a very complex lingo. to exactly translate the text provided by you is difficult as i do not know the full storey....you only providet an abstract of ? only. spelling mistakes on your behalf do not help either. i'm guessing van = von , meten = metern, trefe maybe equels tiefe. ........ deposits of very dence sand, grid enhanced with clay with a minimum thickness of several meter, marked by the slow acent  of mechanical ........last bit missing because of trefe....eigenschaffen - trefe ?? sorry !