-
Archeocyathids from the
Poleta formation,
eastern California...
-
Archeocyathids from the
Poleta formation in the
Death Valley area...
-
Period when the
first fossils of animals,
including trilobites and
archeocyathids, as well as the animal-like Caveasphaera, appeared. In the
second half...
- periods, and then for
faunal stages and zones. Ammonites, graptolites,
archeocyathids, inoceramids, and
trilobites are
groups of
animals from
which many species...
-
mixed collection of fossils: spines,
sclerites (armor plates), tubes,
archeocyathids (sponge-like animals) and
small s**** very like
those of brachiopods...
- the
first appearance of hard-s****ed
arthropods called trilobites and
archeocyathid sponges at the
beginning of the
Cambrian Period. In the
early 20th century...
-
fauna is biomineralized,
including brachiopods, hyolithids, trilobites,
archeocyathids, and helicoplacoids,
which are
often articulated. Non-mineralized components...
- it has also been
described as a quasi-sponge,
possibly akin to the
archeocyathids or
other hypercalcified sponge. The
chief difference from archaeocyathids...
- bottom-dwelling
marine invertebrates. Cone-shaped archaeocyathids/
archeocyathids; cup-shaped archaeocyathans/archeocyathans; reef-building pleosponges;...
- greywackes,
intercalated are
carbonates and rhyodacites. In the CadÃ
nappe archeocyathid-bearing
limestones occur during the
lower Cambrian. With the
onset of...
