-
marine strata in Quebec. S**** of
Gasconsoceras are
rapidly enlarging gyrocones and
serpenticones covered by fine
transverse and
longitudinal striae and...
-
somewhat compressed cyrtoconic brevicones. More
advanced forms include gyrocones, serpenticones, torticones, and
elongate orthocones and cyrtocones, reflective...
-
included in the
family Uranoceratidae. Its s**** is a
rapidly expanding gyrocone of
about 1.5
narrowly separated whorls. The
surface is
faintly cancellated...
- The s**** of
Laureloceras is a smooth, slender,
compressed cyrtocone or
gyrocone with the
venter more
narrowly rounded than the dorsum.
Sutures are transverse...
- spinose.
Rinceras is illustrated, fig. 311-4 p. K429, as a
closely coiled gyrocone of
about two volutions,
whorls not in contact.
Longitudinal ridges (ribs)...
- now
central Europe. The
Trochoceras s**** is a narrow, smooth,
offset gyrocone consisting of
little more than a
single whorl,
trochoidally grown in the...
- that
contains genera characterized by
exogastric (or
rarely endogastric)
gyrocones, brevicones, and torticones. that tend to
develop vestigial actinosiphonate...
