The late Early Aptian forced regressive event terminating Depositional Sequence A, which subaerially exposed and incised the Early Aptian succession in La Serna Creek (Figs. 1C, Fig. 4, Fig. 6 and Fig. 11A–B, 14A), has been previously studied in the central Galve sub-basin by Bover-Arnal et al. (2009) in the area of Las Mingachas located to the west of the village of Miravete de la Sierra, and in the surroundings of the village of Camarillas (Fig. 1C). In Las Mingachas, which corresponds to a platform-to-basin transition area, this CP-690550 late Early Aptian base-level fall was recorded as a sedimentary wedge exhibiting a poorly- to moderately-sorted grainstone texture deposited in a basinal position, at the toe of the highstand slopes of Depositional Sequence A (Bover-Arnal et al., 2009 and Bover-Arnal et al., 2011a). In the proximal platform top environments found in Camarillas (Fig. 1C), the late Early Aptian stage of forced regression is marked by the presence of a subaerial unconformity incised in highstand carbonates (El Morrón platform; Fig. 3) corresponding to Depositional Sequence A (Bover-Arnal et al., 2009 and Bover-Arnal et al., 2011a). Along La Serna Creek (Fig. 1C), incisions with a clear down-cutting of up to 21 m into the late Early Aptian strata also cut into slope and basinal deposits (Fig. 4, Fig. 6 and Fig. 11A–B, 14A). This fact, which has not been observed in other areas of the Galve sub-basin, where incisions only affected platform top strata (Bover-Arnal et al., 2009 and Bover-Arnal et al., 2011a), indicates clone in the area of La Serna Creek the forced regressive stage of Depositional Sequence A either followed, or co-occurred with tectonic tilting of the fault block (Figs. 1C, 3). An alternative explanation is that the highstand slope and basin environments of La Serna platform were shallower than their correlates associated with the highstand platform top of El Morrón (Fig. 3).
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