Spanish to English Science Geology Thermotectonics Western Pyrenees

This is from a section headed "The Iberia-Eurasia Collision", which begins in the Santonian-Campanian. The term "cabalgamiento" appears a few times in this text, and although I have excellent glossaries on hand, I cannot quite grasp the term enough to find a precise equivalent in English. It might be sliding or riding or shifting, or something else, perhaps simply movement, and I want to be sure I use the correct language in English in this context (tectonics). Here are two example sentences from my text:

En el cabalgamiento de la Sierra Cantabria, al sur de la Cuenca Vasco-Cantábrica (Fig. ), se admite una edad paroximal oligocena reactivada durante el Mioceno.

En el perfil de sísmica profunda ECORS-Pirineos, se observa como la placa euroasiática subduce Iberia y delamina un prisma a favor de los cabalgamientos frontales nor- y surpirenaico.

Thanks in advance for your help. For UK please.
:)