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The Santa Cruz ophiolite of eastern Guatemala includes sedimentary rocks deposited in the Cretaceous proto-Caribbean ocean. Several conclusions, noted below, are based on preliminary study of these strata.

Intra-basalt chert nodules were deposited during Upper Valanginian/Aptian eruptive activity at the proto-Caribbean spreading center. This oceanic crust was partially blanketed in the Aptian/Albian by upward coarsening volcaniclastic debris derived from the proto-Antillean Island Arc during collision of the western proto-Caribbean with thick Pacific plateau basalt. Chert interbeds date off-ax is (seamount?) basaltic eruptions as Albian in age. Argillite melange, possibly Cenomanian in age, formed in an accretionary prism along the leading edge of the advancing Pacific crust. An organic-rich, deep water limestone appears to have been deposited during the widespread Cenomanian Oceanic Anoxic Event.

In this paper I propose to accomplish the following: 1) to make available results of a geological reconnaissance originally presented as an unpublished doctoral dissertation (Rosenfeld 1981.); 2) to place the Santa Cruz ophiolite into the most recent plate tectonic framework; 3) to suggest avenues for further study.

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