TAMANA FORMATION


A g e Miocene
Type Locality Mt. Tamana, Central Range, Trinidad



Throughout the Central and Southern Ranges occur a number of limestone reefs, some of them in tectonically disrupted position; all are essentially algal bioherms of variable sizes and up to 300 ft. in thickness.


The rocks are grey, yellow and white, cavernous and vugular and partly massive, partly bedded, with clay and marl intercalations. In age they appear to be restricted to the Lower and Middle Miocene. Apparently, reef al conditions were established earlier in the Southern than in the Central Range.


The reefs are clearly bound to uplift zones. Younger sediments are not found in the Central Range indicating its positive structural nature. Marine clays, silts and glauconitic sands of Upper Miocene and Younger Age outcrop on the northern flanks suggesting that although the Central Range may not have been fully emergent during this time, nontheless it formed an effective barrier isolating Upper Miocene to Pleistocene deposition in the Northern and Southern Basins.

Outcrop at Brigand Hill (photo - C.Archie)


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