Matt Formation
| Matt Formation | |
|---|---|
| Stratigraphic range: Early Oligocene, | |
| Type | Formation |
| Unit of | North Helvetic Flysch |
| Underlies | Blattengrat Nappe, Wildflysch Nappe |
| Overlies | Elm Formation |
| Lithology | |
| Primary | Slate, sandstone |
| Location | |
| Region | Canton Glarus |
| Country | Switzerland |
| Type section | |
| Named for | Matt, Switzerland |
| Named by | Siegenthaler, 1974 |
The Matt Formation is an Early Oligocene-aged marine geological formation that outcrops in the Glarus Alps of the Canton of Glarus, Switzerland. It is most notable for its fossiliferous slates found near Engi, known as the Engi slates, Glarner Schiefer (Glarus Slate) or Glarner Fischschiefer ("Glarus fish slate"), which contain the well-preserved fossils of fishes, birds, and sea turtles. The metamorphization of the rock has led to many of the fossils appearing somewhat distorted.