| System | Series | Stage | Age (Ma) | European lithostratigraphy |
|---|---|---|---|---|
| Jurassic | Lower | Hettangian | younger | Lias |
| Triassic | Upper | Rhaetian | 201.4–208.5 | |
| Keuper | ||||
| Norian | 208.5–227.0 | |||
| Carnian | 227.0–237.0 | |||
| Middle | Ladinian | 237.0–242.0 | ||
| Muschelkalk | ||||
| Anisian | 242.0–247.2 | |||
| Bunter or Buntsandstein | ||||
| Lower | Olenekian | 247.2–251.2 | ||
| Induan | 251.2–251.9 | |||
| Permian | Lopingian | Changhsingian | older | |
| Zechstein | ||||
| Major lithostratigraphic units of northwest Europe with the ICS's geologic timescale of the Triassic.[1] | ||||
The Lias Group or Lias is a lithostratigraphic unit (a sequence of rock strata) found in a large area of western Europe, including the British Isles, the North Sea, the Low Countries and the north of Germany. It consists of marine limestones, shales, marls and clays.
Lias is a Middle English term for hard limestone, used in this specific sense by geologists since 1833.[2] In the past, geologists used Lias not only for the sequence of rock layers, but also for the timespan during which they were formed. It was thus an alternative name for the Early Jurassic epoch of the geologic timescale. It is now more specifically known that the Lias is Rhaetian to Toarcian in age (over a period of c. 20 million years between 200 to 180 million years ago) and thus also includes a part of the Triassic. The use of the name "Lias" for a unit of time is therefore slowly disappearing.