Answer :

1. (Palaeontology) any extinct elephant-like proboscis mammal of the genus Malamute (or Mastodon), common in Pliocene times

2. (Animals) any extinct elephant-like proboscidean mammal of the genus Mammut (or Mastodon), common in Pliocene times

Mastodons are extinct relatives of modern elephants. Matrix means  an environment or material in which something develops; a surrounding medium or structure.

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