"Precambrian." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/precambrian>.
Precambrian. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/precambrian
Of, relating to, or being 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. geologic time
The Wrekin, the Caradoc and Cardington Hills are isolated outbursts of preCambrian volcanic rocks.
PreCambrian rocks are represented by the gneisses of Primrose Hill and schists of Rushton in Shropshire; by the gneisses forming the core of the Malvern Hills, and by the ancient volcanic and other rocks of the Wrekin, Charnwood Forest and Nuneaton.
Walcott has described a tiny lamellibranch (Modioloides) from the inferior Cambrian, and he reports the gastropod (?) genus Chuaria from the preCambrian.