Ediacara Hills in Southern Australia date back to the late Precambrian. These fossils are body impressions of organisms shaped like disks, fronds and some...

current range of body plans is far from exhaustive of the possible patterns for life: the Precambrian Ediacaran biota includes body plans that differ from...

the known Cambrian lagerstätten are rare and difficult to date, while Precambrian lagerstätten have yet to be studied in detail. The sparseness of the...

giant impacts that help to increase its overall size. c. 4,533 Ma – The Precambrian (to c. 539 Ma), now termed a "supereon" but formerly an era, is split...

highly proliferative clade whose members have a bilaterally symmetric body plan. The vast majority belong to two large superphyla: the protostomes, which...

have been proposed. It lived during the late Ediacaran (final part of Precambrian). The discovery of cholesterol molecules in fossils of Dickinsonia lends...

images of each other) during embryonic development. This means their body plans are laid around a longitudinal axis (rostral–caudal axis) with a front...

appendages. The idea of body plans originated with vertebrates, which were grouped into one phylum. But the vertebrate body plan is only one of many, and...

than 3.5 billion years ago. Stromatolites were much more abundant in Precambrian times. While older, Archean fossil remains are presumed to be colonies...

of animals which do not show any symmetry (i.e. are asymmetrical), the body plans of most multicellular organisms exhibit, and are defined by, some form...

The Avalon explosion, named from the Precambrian faunal trace fossils discovered on the Avalon Peninsula in Newfoundland, eastern Canada, is a proposed...

erniettomorph found in a number of Precambrian deposits worldwide. It is a member of the Ediacaran biota. The three-lobed body is generally flat such that only...

KJ (January 1, 2007). "Poriferan paraphyly and its implications for Precambrian palaeobiology" (PDF). Geological Society, London, Special Publications...

and a common Neoarchean tectonothermal history for West Greenland". Precambrian Research. 314: 129–144. Bibcode:2018PreR..314..129K. doi:10.1016/j.precamres...

tectographs from the Itajaí Basin: A cautionary tale from the Precambrian". Precambrian Research. 403. 107307. Bibcode:2024PreR..40307307B. doi:10.1016/j...

animals that were originally classified into the Cnidaria. The basic body plan of trilobozoans is often a triradial or radial sphere-shaped form with...

biodiversity known as the Cambrian explosion. Most of the currently existing body plans of animals first appeared in the fossil record of the Cambrian rather...

events had to occur in order to form the canyon as it is seen today. The Precambrian gneiss and schist that make up the majority of the steep walls of the...

near-orderly Wilson supercontinental cycle of events. The range rose in a Precambrian event called the Aravalli-Delhi Orogen. The Aravalli Range is a northeast–southwest...

synapomorphies, the notochord, which plays a significant role in chordate body plan structuring and movements. Chordates are also bilaterally symmetric, have...

Phanerozoic), the first three of which are collectively known as the Precambrian, which lasted approximately 4 billion years. Each eon can be divided...

fossil record. The time before the Phanerozoic, collectively called the Precambrian, is now divided into the Hadean, Archaean and Proterozoic eons. The time...

appendages. The idea of body plans originated with vertebrates, which were grouped into one phylum. But the vertebrate body plan is only one of many, and...

St. Francois Mountains in southeast Missouri are a mountain range of Precambrian igneous mountains rising over the Ozark Plateau. This range is one of...

occurred at the start of the Ediacaran period. An orogeny folded the older Precambrian rocks. In the Cambrian time the Tyennan block forming the south west...

Dornbos, S.Q.; Li, C.-W.; Bottjer, D.J. & Davidson, E.H. (August 2002). "Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest...

North America South America Zealandia. Due to lacking the presence of Precambrian cratonic rocks, Zealandia's status as a geological continent has been...

along with a mountainous central area of older Precambrian metamorphic and igneous rocks and late Precambrian to Paleozoic sedimentary rocks, covered by a...

convincing fossil record of the placozoa, although the Ediacaran biota (Precambrian, 550 million years ago) organism Dickinsonia appears somewhat similar...

rocks in England, mostly igneous and metamorphic rocks from the late Precambrian, known as the Uriconian, which are around 680 million years old. The...