-
disappearance coincided with a
rapid diversification of the Demosponges. The
archaeocyathids were
important reef-builders in the
early to
middle Cambrian, with...
- been
found in
rocks dated from 580 million
years ago. In
addition Archaeocyathids,
whose fossils are
common in
rocks from 530 to 490
million years ago...
- the
Early Cambrian (542–513 Ma)
resulted from
calcareous algae and
archaeocyathids (small
animals with
conical shape,
probably related to sponges) and...
- in filter-feeding organisms. The trilobite,
inarticulate brachiopod,
archaeocyathid, and
eocrinoid faunas of the
Cambrian were
succeeded by
those that dominated...
- Botoman-Toyonian
Extinction (BTE),
which included the loss of the
archaeocyathids and
hyoliths and saw a
major drop in biodiversity. The rise in sea...
- Blockkonglomerat), a
Lower Carboniferous wildflysch. However, the
aforementioned archaeocyathids are not three-dimensional fossils, but two-dimensional thin sections...
- reef
formation are
characteristic of
different geologic time periods:
Archaeocyathids appeared in the
early Cambrian;
these gave way to
sponges by the late...
-
structure built by animals),
exemplified by a
small bioherm constructed by
archaeocyathids and
calcified microbes at the
start of the
Tommotian stage about 530...
- a rich
complex of
skeletal elements of
unknown animals, the
first archaeocyathids, brachiopods, tommotiids, and others. Also soft-bodied
extant phyla...
-
boundary definition candidates First appearance of
small s****y
fauna or
Archaeocyathids Lower boundary GSSP
candidate section(s) None
Upper boundary definition...
