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Reactivation of pre-existing zones of crustal weakness commonly results in structural generation of low-relief (≤ 101m) topographic bulges, here called welts, which affect contemporary depositional processes. Lower Cretaceous (Albian) Glencaim, Mesa Rica and Pajarito strata above Sierra Grande basement structure in northeastern New Mexico reveal a spectrum of depositional effects that are best attributed to penecontemporaneous elevation of such a low-relief welt and argue for Albian reactivation of underlying Sierra Grande basement structure.

Transgressive and regressive offshore marine strata of the Glencairn section pinchout in association with the Sierra Grande axis reflecting nondeposition and/or erosion of marine...

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