- and
below Stage 3 of the Cambrian. It is
commonly referred to as the
Tommotian,
after the
Cambrian stratigraphy of Siberia.
Neither the
upper nor lower...
-
paleontologists define the
lower boundary of the
Cambrian at the base of the
Tommotian Stage,
characterized by
diversification and
global distribution of organisms...
- in East Siberia,
where they are
first known from the
beginning of the
Tommotian Age of the Cambrian, 525 million
years ago (mya). In
other regions of...
- the
Eastern European Platform) and for the
carbonate basin (base of the
Tommotian stage of the
Siberian Platform). The
lower boundary of the
Vendian was...
-
Tommotian type section, and most of this
fauna in fact
began to
diversify in a
series of
pulses through the Nemakit-Daldynian and into the
Tommotian....
- sponge-like
animals which lived in the
early to mid-Cambrian
Period (
Tommotian to Botomian).
Cribricyatha were cup-shaped
filter feeders similar to archaeocyathan...
-
Yochelcionella is an
extinct genus of
basal molluscs which lived during the
Tommotian epoch, the
first epoch of the
Cambrian period. This
genus is
often reconstructed...
-
constructed by
archaeocyathids and
calcified microbes at the
start of the
Tommotian stage about 530 Ma,
found in
southeast Siberia. A
major radiation occurred...
- sponge-like
animals which lived in the
early to mid-Cambrian
Period (
Tommotian to Toyonian). They were very
similar to
archaeocyath sponges, with a cup-shaped...
-
which may be a sea snail, a gastropod. It is a
helcionellid from the
Tommotian epoch of what is now Siberia. Its
tightly coiled,
spiral s**** contains...
