The selection of the most complete sedimentary sequences shown in Fig. 7 permitted assemblage of a composite sequence, which contains the most complete record off Pisco (Fig. 10B) and can be used as the chronological basis for paleoceanographic studies. This composite sequence contains sedimentary sequences that
Aclacinomycin A would not been identified if only one core was analyzed. The reconstruction of a composite sequence off Guaymas by Baumgartner et al. (1991) illustrated that each particular core might be missing some laminae, but that sediments from kilometers away usually contained most of the total sequence. Moreover, Baumgartner et al. (1991) only found one large discontinuity that cut across the core sites associated with a large-magnitude earthquake. In contrast, the evidence from the cores off Pisco show many more missing sequences in each core and the composite sequence may still present missing sedimentary sequences that were possibly eroded in all the core sites. Additionally, the composite sequence was assembled from cores retrieved at 200 and 300 m depth and
pyloric sphincter difference in depth may have an influence on some proxies, like the redox sensitive metals, which needs to be accounted in the interpretation of the data. However, in spite of these uncertainties, this composite sequence has overwhelming advantages with respect to sedimentary sequences that contain unknown numbers of hiatus interspersed within laminated sequences.
