Triassic
= Triassic
{c}
The <Triassic> is the earliest <Mesozoic> period, approximately $251.9$ to $201.4$ million years ago.<International Chronostratigraphic Chart by International Commission on Stratigraphy (2026-06)>[Triassic row]{ref} It precedes the <Jurassic>. In a local <sedimentary rock> sequence, a missing part of this interval may reflect nondeposition or later erosion; the absence of a named interval in one section does not imply that no time elapsed there.