Ages & Ages

THE BIG BANG

The Universe

🔵Hadean Eon   (4.6)

Galaxies and Solar Systems Planets are formed by the accretion of gas and dust in a cosmic cloud, but there is no way of estimating the length of this process.

4.5 billion years ago

Earth formed and solidified

🔵Archean Eon  (3.9)

Cyanobacteria/blue-green algae/first microbes to ↘️O2 by photosynthesis

←Earliest oxygen

←Atmospheric oxygen ←Oxygen crisis half of Earth’s 4.6-billion-year history atmosphere contained almost no oxygen

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🔵Proterozoic Eon (2.5)

♦️Paleoproterozoic era (2.5)

  The Paleoproterozoic era is an interval of 900 million years during which the continents first stabilized, eukaryotic (nucleated) cells developed, oxygen-producing photosynthetic bacteria developed, and oxygen from the bacteria combined with iron in the oceans to form most of Earth’s banded iron formations.

Earliest life 🔹Single-celled 🔹Prokaryotics

♦️Mesoproterozoic era (1.6)

The Mesoproterozoic era is an interval of 600 million years whose signature events are the formation and break up of supercontinents and the development of sexual reproduction in organisms

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Phanerozoic Era (1.0)

🔹Multi-celled 🔹Eukaryotes

The Neoproterozoic era in which Earth was hit by the most severe glaciations known—to the extent that ice sheets reached the equator

🔹Tonian Period (1000 million years ago)

🔹Cryogenian Period (850 million years ago)

🔹Ediacaran Period (630 million years ago) ←Ediacara biota

The first multi-celled animals were 🔹primitive metazoa, in 3 basic groups: 🔹sponges, 🔹cnidarians (e.g. corals, sea anemones, and jellyfish) and 🔹worms

In the later parts of the era, the earliest evidence of multicelled life is found, including the earliest animals.

It is unclear exactly how the first multicellular life develops or why this happens, but one possibility is that single-celled organisms go through a stage similar to that of modern choanoflagellates: single-celled creatures that sometimes form colonies consisting of many individuals. Of all the single-celled organisms known to exist, choanoflagellates are the most closely related to multicellular animals, lending support to this theory.

There are no good fossil remains from periods earlier than the Cambrian

The first animal on earth was a marine organism

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Paleozoic Era

🔵CAMBRIAN PERIOD 542      ➡️ALL SEA LIFE

🔵ORDOVICIAN PERIOD 495  ➡️PLANTS

🔵SILURIAN PERIOD 443       ➡️AMNIOTES

The Age Of Fishes

🔵DEVONIAN PERIOD 417     ➡️FISHES

🔵CARBONIFEROUS PERIOD 354

Early Amniotes 350

🔵PERMIAN PERIOD 290       ➡️AMPHIBIANS

This was a four-legged amphibian called Ichthyostega, which is a Greek term meaning “fish roof”

The Age Of Reptiles/Dinosaurs

250 Fish➡️Bony ↗️Reptiles ↗️Dinosaurs➡️Birds        

The Mesozoic Era

🔵JURASSIC PERIOD 250    ➡️DINOSAURS ➡️BIRDS

🔵TRIASSIC PERIOD 200    ➡️Placentalia (Eutheria)

160 ➡️Primatomorpha        ➡️First eutherian Mammal (Shrew)

🔵CRETACEOUS PERIOD  140-65

130 ➡️Flowering Plants

MAMMALS Placentalia(Eutheria) / Marsupiala / Monotremata

❌EXTINCTION (large dinosaurs become extinct 68)

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The Age of Mammals / Primates

Fish➡️ Bony 65  ➡️ Lobe-fin  ➡️ Amphibians  ➡️ Amniotes ➡️ Tetrapoda

🔵PALEOGENE PERIOD 65-23

🔵🔹PALEOCENE EPOCH 65

🔵🔹EOCENE EPOCH 56 (eo dawn)

🔵🔹OLIGOCENE EPOCH 34 (oli few)

🔹Catarrhini  30 🔹Cercopithecoidea

🔸Cercopithecidae (Old World monkeys) 🔸Hylobatidae (Lesser Apes)

🔹28 Hominoidea (Apes – Great Apes & Lesser Apes)

🔵NEOGENE PERIOD 23-2.58

🔵🔹MIOCENE EPOCH   Mio (less)

👤Hominidae Hominids / great apes” 15            

🔺The 1st hominin: Sahelanthropus tchadensis 7.6

🔹Genus Homo starts splitting off from the chimpanzee Genus PAN 6

🔵🔹PLIOCENE EPOCH 5.33 Plio(more)

👤HOMININI (3 subtribes)

PANINA (Chimps)

AUSTRALOPITHICINA 2.5

HOMININA ~ 3.3 M HOMININS using stone tools

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PRE-HISTORY BEGINS

2.5 The Age of Humans

🔵QUATERNARY PERIOD (2.58) 🔴PALEOLITHIC AGE / 🔴THE STONE AGE

🔵🔹PLEISTOCENE EPOCH  (2.5m – 11.7k)most new / THE ICE AGE

Lower Paleolithic Age

GENUS HOMO

The Ice Age lasts nearly 2 million years

🔹Lower Pleistocene 2.5

The Stone Age

🔺Homo habilis 2.3

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MODERN MAN

🔺H.heidelbergensis lives in Africa & Europe for 500 years 800

🔹Middle Pleistocene 780

430 🔺H.neanderthalensis

325 Oldest surviving early human footprints

315 Root Ancestor (H.sapiens) AMH

315👤ROOT ANCESTOR / AMH  (Speciation begins)

Middle Paleolithic

270👤Y-DNA haplogroup A00 (“Adam”)

250 MIGRATION OOA (-130)

🟪🙎‍♀️EVE This homeland, the researchers suggested, is Makgadikgadi, a vast wetland some 46,000 square miles (120,000 square kilometers) in area, or roughly twice the area of Lake Victoria, Africa’s largest lake today. The team found that mitochondrial Eve and her descendants lived in this region for about 30,000 years (from 200,000 to 170,000 years ago) before the L0 lineage split into its first subgroup. 

“This tells us that these early humans must have stayed within the homeland region and not left” during that time, Hayes said.

The Ice Age Ends

🔹Upper Pleistocene Epoch 126

 

Upper Paleolithic 45

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Holocene Epoch

🔹Holocene Epoch 11.7

🔺Mesolithic 11.7 (Indus Valley)

Farming

🔺Neolithic 6-4.5

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HISTORY BEGINS  4.5

👤 Most recent common ancestor👤

Sometime in this period (3k-3hBC) lived the latest human that is the common ancestor of all present day humans, the rest having no present day descendants, or being ancestors of a subset of all present day humans

 

Writing 4.5

4.5 develops in Sumer/Egypt,beginning of recorded history.

Bronze Age 4.5

Early Bronze Age (3000–1500 )all bc 3000 BC 110m men in europe

Middle Bronze Age (1500–1200 )

Late Bronze Age (1200–500 )

 

Iron Age 2.5

500bc

HISTORY ➡️ ROMAN

 

ROMAN ➡️ 500

500 ➡️ 1000

1000 ➡️1250

1250 ➡️ 1500

1500 ➡️

Burnt

I am an Amateur Gynaecologist with a love of Maidenhair Ferns and a fondness for interpreting Vermeer's Paintings as Metaphors ...

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