Geologic Timescale of Sabrim

Sabrim's geology is unique to the planet. As such, its natural history cannot be recorded with the same standards used for Earth's own deep past. A separate timescale exists, using Sabrim's locations and geologic features in its nomenclature and period designation. 
Note that many of Sabrim's indigenous folktales, myths, and origin stories conflict with each other and the following graph; this is intended to be an objective, scientific look at the planet's geologic history separate from each nation's mythos and most knowledge of the prehistory of Sabrim is out-of-character for the time being. 
ERA 	PERIOD 	MILLION YEARS B.P.	NAMED AFTER: 	EVENTS AND FEATURES
Novolithic 	Regolithic 	3-present 	Regolith (soil) 	Sentient life forms (humans, elves, fae, gnomes, etc.) evolve.
Nov. 	Tavkarian 	23-3 	Mount Tavkaris in Meshkar. 	Sabrim's 4th supercontinent begins rifting.
Nov. 	Ploughwaterian 	48-23 	Ploughwater basin, Joranstone proliferation 	Evolution of most modern mammal and bird groups. Coral reefs abundant once more.
Mesolithic 	Kalibic 	80-48 	Kaliba River basin and guYahkathulu mountains. 	Evolution of most modern plants and fish; Mass extinction of reptiles and marine invertebrates at the end of this period.
Mes. 	Putlastrian 	105-80 	Putlastros tribe 	Climate maximum as 4th supercontinent forms, bivalves replace corals as dominant reef fauna; first dragons.
Mes. 	Tyskenautian 	161-105 	Tyskenautii mountains 	Warm, wet climate as reptile megafauna dominates land and sea. First birds and flowering plants appear at this time.
Mes. 	Quadrassic 	220-161 	Fourth in the mesolithic series 	First mammals and dinosaurs appear; mass extinction of primitive reptiles and amphibians.
Mes. 	Quintassic 	258-220 	Fifth in the mesolithic series 	Diversification of primitive synapsids, reptiles, and amphibians following an ice age.
Archaeolithic	Anthracitic 	365-258 	Anthracite deposits 	First coniferous trees and fully terrestrial tetrapods. Large coal swamps dominate much of the land as 3rd supercontinent fractures.
Arc. 	Ohnyrian 	407-365 	Ohnyr Valley 	First amphibians and primitive seed plants.
Arc. 	Entshonalangian	480-407 	Entshonalanga mountain range 	First insects and vascular plants; 3rd supercontinent forms; lobe-finned fish walk on land as placoderms dominate the ocean.
Arc. 	Vardhemian 	532-480 	Vardhem 	Diversification of fish, first land plants and fungi; mass extinction of predatory marine arthropods and mollusks at the end of this era.
Arc. 	Estrevenian 	640-532 	Estrevenya 	Radiation of most animal phyla, including fish, arthropods, mollusks, worms, and many others.
Arc. 	Argentiferous 	710-640 	Silver-bearing. Type locality somewhere in Stribrna Joraje	Increased volcanism creates basalt and silver deposits and causes an ice age as 2nd supercontinent rifts.
Plutolithic 	Primozoan 	900-710 	Thought to be when the first animals evolved. 	Oldest known animals. 2nd supercontinent forms.
Plu. 	Mawunian 	1150-900 	the city and region of Mawun 	Oldest known fungi and green algae.
Plu. 	Chvarakic 	1500-1150 	Chvarakia 	Oldest red algae; Large glaciation nearly covers Sabrim in ice.
Plu. 	Ferrufluminic 	2200-1500 	 	Stromatolite reefs common; banded iron formations caused by mass oxygenation of the ocean.
Plu. 	Avaratic 	2800-2200 	Avarati tribe. 	First stromatolites and eukaryotic cells (protists); first supercontinent forms and rifts.
Plu. 	Astherian 	3100-2800 	Astheria- specifically, its diamonds. 	Oldest evidence of photosynthetic bacteria; mass volcanism drives global warming and the formation of many diamonds.
Sheolian 	Pitran 	3900-3100 	Pitra River of Citrala. 	Last universal common ancestor of all life on Sabrim lives; tectonic activity begins. Oldest evidence of life.
She. 	Lectulan 	4500-3900 	Bedrock. 	Nonliving organic chemistry; oceans form after heavy meteorite bombardment.
She. 	Incognitian 	prior to 4500 	Unknown, geologically 	Formation of Sabrim, its moons, and the crust.
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