Mya

They developed around 1500 mya and allowed eukaryotes to carry out oxygenic photosynthesis.

Cartilaginous fish (Class Chondrichthyes): The most primitive 'jawed' vertebrates evolved about 400 Mya. Their skeleton is composed of entirely cartilage.

Paleozoic Era an early geological period 360-340 mya
(paleo = ancient; zoa‚ zoo = animal)
Pangea the name of the supercontinent which existed 180 mya and contained all current continents
(pan = all; gea‚ geo‚ gaia = earth) ...

Amborella not a "basal angiosperm" ... A theory of much earlier angiosperm origin and proliferation (360 mya) is ... a b c Angiosperm Phylogeny Group (2003) ...
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See also: Evolution, Trans, Long, Origin, Organ