Arkell.1956.Jurassic..

CALLOVIAN
THE PYRENEES 223
Ammonites of Lower, Middle and Upper Callovian dates are recorded,
but their stratigraphical relations remain to be elucidated. At the west
end of the range, where they occur, the stage comprises 50-100 m. of
alternating fine-grained limestones and sandy marls which are altered to a
sand. A record of Quenstedtoceras lamberti (Sow.) is noteworthy (Palacios,
1919, p. 63). In several places a good Hecticoceras fauna of the Middle to
Upper Callovian is recorded, also Reineckeia anceps, Phlycticeras and several
forms of Macrocephalites, which will repay closer scrutiny (Dubar, 1930,
pp. 594, 606; Lamare, 1936, pp. 56, 86, 178, 183).
BATHONIAN
Up to 60 m. of limestone with thin marly beds and some brachiopods
may belong here (Dubar, 1930, p. 593). The only Bathonian ammonites
recorded are Perisphinctes procerus, P. arbustigerus, Oppelia aspidoides,
O. cf. subcostaria, Sphaeroceras sp. (Palacios, 1919, p. 63; Dubar, 1925,
pp. 247, 251). These specific names imply the presence of the Bathonian
genera Procerites, Wagnericeras, Oxycerites, Paralcidia and Bullatimorphites.
BAJOCIAN
In the upper valley of the Bidassoa (which runs into the Bay of Biscay
on the frontier, between San Sebastian and Bayonne), Dubar (1930)
made out a clear sequence of Aalenian and Bajocian faunas, and similar
sequences have been published for other places near the western end of the
range by Lamare (1936, pp. 189, 191, 338). Some additional ammonites
are recorded by Palacios (1919) and Dubar (1925, p. 251). The total
thickness is up to 100 m. or more, mostly limestones.
Upper Bajocian is represented by various Garantiana, Parkinsonia,
Spiroceras, Bigotites, Lissoceras.
Middle Bajocian is represented by various Stephanoceras, Chondroceras,
Sphaeroceras.
Lower Bajocian is represented by Ludwigia, Brasilia, Graphoceras,
Tmetoceras, etc. (some figured by Dubar, 1930).
TOARCIAN
Limestones, marly limestones and marls of this age are widespread,
almost ubiquitous, and richly fossiliferous. In Lerida, in the SE., Dalloni
(1930, p. 170) recognizes the following horizons:
2. Beds with Leioceras opalinum, Pleydellia aalensis, Dumortieria
radians and Grammoceras distans; with beds of Gryphaea sublobata at
top, containing no cephalopods.
ic. Beds with Hammatoceras insigne, Grammoceras striatulum, G.
fallaciosum, G. thouarsense, Phymatoceras erbaense, P. bayani, Haugia
variabilis.
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