Changes

Some tectonic activity extended into the [[Neocomian]] (132 Ma; see Figure 27), possibly associated with the rifting, and uplifted blocks south of the Yaguajay* belt. The result was denudation of previously deposited sediments as indicated by northward shedding of carbonate clastics ([[Sabanilla Fromation|Sabanilla* Formation]]), a southward increase in basement exposures (La Rana, Tres Guanos, Rancho Veloz), and deposition of the [[Jobosi]]* arkosic conglomerate. This basement could have been derived from a continental block, here named the La Rana block (after the best exposures) and similar to the Maya or Chortis blocks, that was overridden by later nappes.

Some tectonic activity extended into the [[Neocomian]] (132 Ma; see Figure 27), possibly associated with the rifting, and uplifted blocks south of the Yaguajay* belt. The result was denudation of previously deposited sediments as indicated by northward shedding of carbonate clastics ([[Sabanilla Fromation|Sabanilla* Formation]]), a southward increase in basement exposures (La Rana, Tres Guanos, Rancho Veloz), and deposition of the [[Jobosi]]* arkosic conglomerate. This basement could have been derived from a continental block, here named the La Rana block (after the best exposures) and similar to the Maya or Chortis blocks, that was overridden by later nappes.

In central Cuba, the Upper Jurassic and Neocomian beds were only partially eroded. In western Cuba, shallow-bank carbonates, similar to those of the [[Vinas Group|Vinas* Group]], accumulated atop the La Rana granodiorite [http://en.wikipedia.org/wiki/Horst_%28geology%29 horst] and formed the Guajaibon–Sierra Azul belt. South of the La Rana basement horst, deep-water limestones of the Mayari, Collantes, and Cobrito Formations were deposited and preserved.

In central Cuba, the Upper Jurassic and Neocomian beds were only partially eroded. In western Cuba, shallow-bank carbonates, similar to those of the [[Vinas Group|Vinas* Group]], accumulated atop the La Rana [https://wwwf.imperial.ac.uk/earthscienceandengineering/rocklibrary/viewglossrecord.php?gID=00000000073 granodiorite] [http://en.wikipedia.org/wiki/Horst_%28geology%29 horst] and formed the Guajaibon–Sierra Azul belt. South of the La Rana basement horst, deep-water limestones of the Mayari, Collantes, and Cobrito Formations were deposited and preserved.

Farther south, rifting continued, accompanied by outpouring of tholeites and other [[Wikipedia:Basic_rock|basic]] to [https://wwwf.imperial.ac.uk/earthscienceandengineering/rocklibrary/viewglossrecord.php?gID=00000000012 ultrabasic] material forming a layered [[Oceanic crust|oceanic basement]] consisting of [http://geology.about.com/od/rocks/ig/igrockindex/rocpicperidotite.htm peridotite], [http://www.britannica.com/EBchecked/topic/223075/gabbro gabbro], sheeted [http://www.britannica.com/EBchecked/topic/163476/dike dikes], [[Wikipedia:Pillow lava|pillow basalts]] (old volcanics of the Domingo* sequence), and associated sediments. Although some genetic relationship exists between the [[Domingo*]] sequence and the El Sabalo–Nueva Maria lithologies, these belong to two entirely different provinces. [[El Sabalo Formation|El Sabalo]] and the [[Nueva Maria Formation]]s, like the granodiorites, belong to the autochthonous nappes and were at the continental margin, whereas the Domingo* sequence forms the base of the allochthonous nappe and is entirely oceanic.

Farther south, rifting continued, accompanied by outpouring of tholeites and other [[Wikipedia:Basic_rock|basic]] to [https://wwwf.imperial.ac.uk/earthscienceandengineering/rocklibrary/viewglossrecord.php?gID=00000000012 ultrabasic] material forming a layered [[Oceanic crust|oceanic basement]] consisting of [http://geology.about.com/od/rocks/ig/igrockindex/rocpicperidotite.htm peridotite], [http://www.britannica.com/EBchecked/topic/223075/gabbro gabbro], sheeted [http://www.britannica.com/EBchecked/topic/163476/dike dikes], [[Wikipedia:Pillow lava|pillow basalts]] (old volcanics of the Domingo* sequence), and associated sediments. Although some genetic relationship exists between the [[Domingo*]] sequence and the El Sabalo–Nueva Maria lithologies, these belong to two entirely different provinces. [[El Sabalo Formation|El Sabalo]] and the [[Nueva Maria Formation]]s, like the granodiorites, belong to the autochthonous nappes and were at the continental margin, whereas the Domingo* sequence forms the base of the allochthonous nappe and is entirely oceanic.