geology

[patrixcia]

a thin layer searating 2 strata

[caramba22242]

what's searating. not in my dictionary

[kev100]

Hi Caramba,

I think it is supposed to be separating

[kev100]

This is a wild stab

Laccolith: A sill-like igneous intrusion that forces apart two strata

[Clanad]

Take your pick, from my Geology 101 text: (Admittedly dated)

Varve, marl, lens, horizon, aquitard, dike, bar, lamination(or laminate), scale (or scaling). Depends on which type of rocks are involved.  During my field work for study in geology, these layers were typically called "boundary layers"...