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Definition of Tonian
1. Adjective. (geology) Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago. ¹
2. Noun. (geology) The Tonian period. ¹
¹ Source: wiktionary.com
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1. Adjective. (geology) Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago. ¹
2. Noun. (geology) The Tonian period. ¹
¹ Source: wiktionary.com