Geologic Timescale of Rathnir and Eldham

The Geologic Timescale is a chart used by geologists and paleontologists to classify the ages of rock formations. As such, its use has been extended to act as a summary of events in deep time, as each period and era has its own specific events and biota unique to it.
For a list of fossil organisms known from each period, refer to the Fossil Taxa list page.
The following chart lists all eras and periods, descending with age. Older strata are generally overlain by younger ones, after all- see the law of superposition.
ERA 	PERIOD 	SYMBOL	MILLION YEARS B.P.	NAMED AFTER: 	EVENTS:
Epilithic 	Regolithic 	R 	3.5-present 	Regolith (soil) 	Ice ages, all modern history
 	Melwendian 	M 	40-3.5 	Warlord kingdom of Melwende 	Worldwide biome distribution de-correlates with latitude
 	Cuiciloan 	C 	69-40 	Amber deposits of the island of Cuiciloa, Huitca 	beginning of Age of Mammals; first creepers
Neomesolithic	Iridaceous 	I 	91-69 	Worldwide iridium-rich clay layer at the upper boundary 	Flowering plants become dominant; mollusk reefs replace corals
 	Qalmanian 	Q 	143-91 	Zir-Qalam, Yimmu-Audal 	First flowers, social insects, modern fish
 	Dracian 	Δ 	183-143 	Drak Yamar 	First crown-group dragons, mammals, and birds
 	Lothranic 	L 	202-183 	Lothranis Sea, Aurlunor Velande 	Many modern reptile and amphibian groups evolve
 	Quintassic 	P 	248-202 	The 5th period of the Neomesolithic 	Earliest turtles, dinosaurs
Promesolithic	Ardatian 	A 	270-248 	Ardat-Mosul 	Age of proto-mammals and large amphibians
 	Tyrfinic 	t 	340-270 	Peat, which became the period's abundant coal deposits 	Coal swamps; divergence of basal amniotes into synapsids and diapsids
 	Loanian 	λ 	420-340 	Lo'Oix people 	First vascular plants, tetrapods
 	Tudenanian 	T 	490-420 	Tudenan people 	First nonvascular land plants and terrestrial invertebrates; jawed fishes
 	Zamotzic 	Z 	530-490 	Zamotz island 	Fishes, cephalopods, and most marine phyla emerge
Plutolithic 	Certarian 	Ꞓ 	610-530 	Certaria, UBSR 	Oldest known bilaterian animal fossils
 	Primozoan 	Π 	1000-610 	First animal life 	Sponges and other primitive animals emerge at the close of this period
 	Argentiferous 	Ag 	1700-1000 	Various silver deposits in the former Sterling Crownlands 	First green and red algae, fungi; two global ice ages
 	Ursarctian 	U 	2400-1700 	Ursus arctos, Grizzlybear Territory 	First eukaryotic cells
 	Dorasterrolithic	D 	3000-2400 	Dorasterrock, Bardonia 	Stromatolite reefs common; Great Oxygenation event
Momaganic 	Transplutolithic	Tr 	3500-3000 	"Across the Plutolithic"; originally covered all of the Momaganic Era	Photosynthesis
 	Natalian 	N 	4000-3500 	"Birth"- the first organisms 	First life
 	Shahban 	S 	4500-4000 	Bedrock. 	Solidification of the crust, first oceans, primordial soup
 	Incognitian 	X 	prior to 4500 	Unknown, geologically 	Formation of the planet and moon
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