Definition of Proterozoic in English:

Proterozoic

adjective

Geology
  • 1Relating to or denoting the aeon that constitutes the later part of the Precambrian, between the Archaean aeon and the Cambrian period, in which the earliest forms of life evolved.

    • ‘The key to understanding the early evolution of eukaryotes lies in the Proterozoic fossil record, especially microfossils.’
    • ‘This is the general name for all Archaean and Proterozoic basement gneisses of the NW Scotland mainland and Outer Hebrides.’
    • ‘The bulk of the Mozambique belt of eastern Africa and Madacascar is underlain by deeply eroded and multiply deformed high-grade Proterozoic and Archaean rocks.’
    • ‘Archean and most Proterozoic sedimentary rocks are notable for their distinct lack of any bioturbated textures.’
    • ‘No rock standard has been identified formally as marking the base; at the top of the Proterozoic the Cambrian - Precambrian boundary is identified on the basis of fossils.’
    1. 1.1The Proterozoic aeon or the system of rocks deposited during it.

Origin

Late 19th century: from Greek proteros former + zōē life, zōos living + -ic.

Pronunciation:

Proterozoic

/ˌprəʊt(ə)rəˈzəʊɪk/