The Lutetian is a stage of the middle EoceneEpoch. It spans the time between 48.6 ± 0.2 Ma and 40.4 ± 0.2 Ma (million years ago). Faunal stages are a subdivision of geologic time used primarily by paleontologists who study fossils rather than by geologists who study rock formations. ... The Eocene epoch (56-34 MYA) is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era. ... The word epoch can mean either an interval of time, or a particular point in time used as a reference point. ... Mega-annum, usually abbreviated as Ma, is a unit of time equal to one million years. ...
In Hampshire and the Isle of Wight the Lutetianstage (formerly known as the Middle Eocene) is represented by approximately 151 metres of sands and clays, collectively known as the Bracklesham Group.
The Lutetianstage began with a shallow marine or brackish estuarine phase, which was followed by the marine phase known as the Earnley formation.
The fossil fauna of the Lutetian is dominated by invertebrates, particularly molluscs.
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