In Love with Geosciences!

Ordovician sea
“Astraspis (at the bottom) and the Arandaspida (at the top) (Arandaspis, Sacabambaspis, and a couple of others). They’re not known from the same area though. Astraspis is from North America, and the arandaspids are all from South America or Australia.
There’s evidence of arandaspids right through the Ordovician.”

Ordovician sea

Astraspis (at the bottom) and the Arandaspida (at the top) (ArandaspisSacabambaspis, and a couple of others). They’re not known from the same area though. Astraspis is from North America, and the arandaspids are all from South America or Australia.


There’s evidence of arandaspids right through the Ordovician.”

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    Ordovician sea
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