Arkell.1956.Jurassic..

TRINIDAD 573
UPPER OXFORDIAN AMMONITES OF THE JAGUA FORMATION
(SR = Sanchez Roig)
Phylloceras jaguaense SR
Phylloceras lagunasense SR
Glochiceras aff. microdomum (Oppel) (Jaworski, 1940, p. 97)
Ochetoceras canaliculatum var. burckhardti O'Connell
Ochetoceras mexicanum Burckhardt (O'Connell, 1920)
Ochetoceras (Cubaochetoceras) imlayi SR (includes 'Neoprionoceras' girardoti Jaworski,
1940)
Ochetoceras (Cubaochetoceras) constanciae SR
Ochetoceras (Cubaochetoceras) vignalense SR
Euaspidoceras vignalense Spath (SR 1951, pi. 28)
Euaspidoceras o'connelli SR
Vinalesphinctes niger Spath (Jaworski 1940 and SR)
Vinalesphinctes roigi Spath
Vinalesphinctes brodermanni SR
Vinalesphinctes grossicostatum SR sp. (sub Arisphinctes)
Perisphinctes of the following subgenera:—
Perisphinctes sensu stricto
Perisphinctes anconensis SR (sub Virgatosphinctes)
Perisphinctes} diversicostatus SR (deformed; sub Dichotomosphinctes)
Dichotomosphinctes spathi SR (note lappet) 1
Dichotomosphinctes plicatiloides O'Connell, including cubanianus SR
and probably also Dichotomosphinctes catalinensis SR sp. (sub Berriasella)
Arisphinctes sanchez-roigi sp. nov. (castroi SR, sub Dichotomosphinctes, non Choffat)
Arisphinctes cubanensis SR sp. (sub Ataxioceras lictor)
Arisphinctes? aguayoi SR (sub Dichotomosphinctes)
Arisphinctes} planatus SR (sub Dichotomosphinctes)
Arisphinctes} gregarius SR (sub Dichotomosphinctes)
Arisphinctes} guanensis SR (sub Discosphinctes)
(The last four names might with more material be reduced; they seem to be
forms of the group of P. berlieri de Loriol)
Pseudarisphinctes vignalensis SR (sub Dichotomosphinctes)
Pseudarisphinctes imlayi SR (sub Decipia)
Discosphinctes antillarum Jaworski
Discosphinctes carribeanus Jaworski (sub 'Planites' virgulatus)
Discosphinctes subguanensis sp. nov. (Per. (Planites) virgulatus var. guanensis SR, non
Per. (Discosphinctes) guanensis SR)
Orthosphinctes (or close derivatives thereof) cubanensis O'Connell, including P.
delatorii O'Connell
Orthosphinctes rutteni Jaworski (sub 'Planites')
Subgen. nov. (possibly related to Vinalesphinctes) subconsociatus Spath (SR 1951,
pi. 16, fig. 2, sub Prososphinctes)
Second subgen. nov. petrosus SR (sub Ataxioceras)
TRINIDAD
It is possible that the Vinales Limestone is represented among partlymetamorphosed
limestones and schists of unknown age that form the
axial mountain range of the island of Hispaniola (Haiti), but no fossils
have been found. Otherwise the only other Jurassic in the West Indian
islands is in Trinidad.
Trinidad is a direct continuation of the northern coastal mountains of
Venezuela, from which only a narrow channel separates it, and it is a long
way from Cuba and the Gulf of Mexico. Nevertheless it is described in
this chapter because it is one of the West Indian islands and is more likely
to be looked for in a chapter on middle America than in one on South
America. No Jurassic is known in eastern Venezuela, and Trinidad is
nearly as remote from the Jurassic in the West Venezuelan and Colombian
Andes as from that in Cuba.
This extremely isolated occurrence of Jurassic was discovered in the
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