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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