Proterozoic

1 subentry

• Proterozoic. See also geologic ages
• life-dawn era, 550 to 400 million years ago (58:7.1) (59:0.3)

Cross-references

• See also geologic ages

Cited alongside

Headwords that cite the same paragraphs as this one, commonest first. The number is how many subentries each has.

• geologic ages 40
• life-dawn era 1