The
Late Jurassic is the third
epoch of the
Jurassic period, and it spans the
geologic time from 161.2 ± 4.0 to 145.5 ± 4.0
million years ago (Ma), which is preserved in
Upper Jurassic strata. In European
lithostratigraphy, the name "malm" indicates rocks of Late Jurassic age. In the past, this name was also used to indicate the unit of geological time, but this usage is now discouraged to make a clear distinction between lithostratigraphic and geochronologic/chronostratigraphic units.