scienceeeee!?

Question

what are some examples of animals in the precambrian times?

Answer 1

You picked a nifty time period for examples of animals. It is a tough one, makes for a tough ant farm.. As far as we know it contains 90% of geologic time and contains 3 eons that cover about 4 billion years. Includes 3 Eons:
Hadean 4.6 - 3.8 bya (or 4.6 - 3.96 bya) - no record
Archean 3.8-2.5 bya
Proterozoic 2.5-0.57 bya
Virtually nothing is known about the Hadean time frame.
TheArchean Life Stromatolites (cyanobacteria or BGA - blue-green algae) in carbonate sediment oldest are 3.4 - 3.5 by old also in rocks 2.8 - 3 by old more abundant in Proterozoic rocks Algal filament fossils sometimes found 3.5 b.y. at North Pole, western Australia Spheroidal bacterial structures (Monera) Fig Tree Group, South Africa 3.0 - 3.1 by prokaryotic cells; cell division?

Precambrian Fossil Record
Prokaryotes small size (most < 20 microns)

Onverwacht Series, South Africa 3.2 - 3.7 by North Pole, W. Australia 3.5 by algal filaments, among the oldest cells known

Fig Tree Group 3.0 by spheroidal bacterial structures may show cell division Gunflint Fm, Ontario, Canada 2.0 by bacteria and stromatolites with algal filaments. Stromatolites built by blue-green algae, also called cyanobacteria (prokaryotes - Monera).
oldest are 3.4 - 3.5 by also in rocks 2.8 - 3 by Bulawayan Gp, S. Rhodesia 3.1 - 2.7 by Pongola System, N. Natal Province, S. Africa 3.1 by Stromatolites become common about 2.25 by.
May have been more resistant to UV radiation because of sediment covering. Presence of stromatolites and blue-green algae (photosynthetic) led to buildup of oxygen in atmosphere.

Eukaryotes larger size (most > 60 microns) First fossil cells with what appear to be organelles 1. - 1.2 by Beck Spring Dolomite, California 1.3 by oldest convincing eukaryotes branched filaments
Bitter Springs Fm, chert, Australia 0.8 - 0.9 by impressive eukaryote fossils Metazoans (multicellular) Trace fossils (or Ichnofossils) oldest are about 0.7 by (700 my) Trace fossils are relatively uncommon until 0.57 by (570 my) Trace fossils increase in diversity through time Examples of Precambrian trace fossils: Brooksella, Grand Canyon 1 by jellyfish-like; organic? questionable trace fossils even older a. Medicine Peak Qtzt, Wyoming 2.0 - 2.5 by tube-like structures (found 1976, 1983) older than oldest eukaryote cells
Oldest Metazoan Body Fossils = EDIACARA FAUNA
Originally discovered in Pound Qtzt, Ediacara Hills, S. Australia; later found worldwide (including Piedmont area of NC) at low paleolatitudes. 0.59 - 0.7 by (590 - 700 my) impressions and molds of animals (associated with trace fossils) ichnofossils.

Oldest diversified and relatively abundant marine fauna known. No skeletons. All soft-bodied, jellyfish-like animals. 26 species, 18 genera, 4 or more phyla. 67% Cnidaria 25% Annelids (worms)
5% Arthropods

The Ediacara fauna marks the beginning of visible life (and therefore, the real, if not the official beginning of the Phanerozoic). The Phanerozoic really begins in the Late Precambrian, doesn't it? Should this fauna be included in a new geologic period at the base of the Phanerozoic? Various researchers have referred to it as the Vendian Period or the Ediacaran Period.
Introduction to the Vendian Period (600-540 mya)
Vendian Life

Learning about Vendian animals
Precambrian skeletonized faunas
First hard parts appear after Ediacaran but before Cambrian officially begins. 580 - 590 my. Minute scraps, denticles, and plates of unknown affinity. Calcium- phosphate tubes, cones, opercula, chitinoid tubes. Calcareous algae also appeared at this time (plants with hard parts).

Answer 2

The Ediacaran biota (also known as Ediacaran fauna(s), Vendian biota, Vendian forms, Vendian fauna(s), Vendobionta or Vendozoa) are a group of ancient lifeforms that are found in rocks of the Ediacaran Period, a bit older than the Cambrian faunas that represent the oldest (shelled) fossils of classical paleontology.