The term "Northgrippian" refers to a geological age or stage within the Late Ordovician period, which occurred approximately 458 to 453 million years ago. It is part of the broader Ordovician period, which is known for its diverse marine life and significant geological developments. The Northgrippian is specifically recognized in the context of the stratigraphy and paleontology of certain regions, particularly in North America and parts of Europe.
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