From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
refractive bed /ɹɪfɹˈaktɪv bˈɛd/
refraktierende Schicht
Synonym: refractive layer
see: layer of rock, rock layer, layer, rock stratum, stratum, rock bed, bed, rock formation, formation, rock layers, layers, rock strata, strata, rock beds, beds, rock formations, formations, superposed layer, superposed bed, outcropping bed, exposed stratum, superjacent layer, superimposed stratum, subjacent stratum, subjacent formation, sheet of rock, lamina, persistent stratum, permeable layer, permeable stratum, permeable bed, pervious stratum, pervious bed, oil storer, gas stratum, upper stratum, superstratum, upper bed, uppermost layer, topset stratum, top bed, enclosing layer, substratum, subsurface layer, subsurface stratum, sublayer, underlayer, lowermost layer, basal stratum, transgressive stratum