American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Of or belonging to the geologic time period between Hadean Time and the Cambrian Period, often subdivided into the Archean and Proterozoic eras, comprising most of the earth's history and marked by the appearance of primitive forms of life. See Table at geologic time.
- n. The Precambrian Eon.
Century Dictionary and Cyclopedia
- Noting rocks older than the Cambrian or first fossiliferous strata: used by many writers as preferable to azoic, eozoic, archæan, primitive, etc, because it is non-committal.
- n. Precambrian strata.
- n. the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
“The Canadian Shield (aka the Precambrian Shield, or Laurentian Shield) is the Precambrian rock that covers about 8 million square kilometers of Eastern and Central Canada.”
“The Proterozoic, Archean and Hadean are often collectively referred to as Precambrian Time, and sometimes also as the Cryptozoic.”
“The first 3 eons are part of a time interval known as Precambrian time 4 billion-year interval with very few fossils.”
“(551-2500 million yrs BP) Also known as Precambrian Eukaryotic cell organisms develop.”
“I mean it is Pretty Freakin’ Classified and though we have been called a Precambrian Folklore Collection some think we are more like a Positive Frenzied Circasaurus.”
“Paleobotany: Sedimentary rocks show pollen in very deep, "Precambrian" strata.”
“The term 'Precambrian' is widely used for the geologists and paleontologists, but that term is not official name.”
“: The fossil record shows inadequate transitional forms to support belief in the Paleobotany: Sedimentary rocks show pollen in very deep, "Precambrian" strata.”
“Three and a half hours north of Toronto, is Pointe au Baril, a remote archipelago in Georgian Bay on a cusp of the Canadian shield – a large area of exposed Precambrian rock.”
“Then we began our plunge down a Precambrian staircase, a flight of a billion years or so, down through layers of sedimentary, metamorphic and igneous rock to the Lion River.”
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