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Archaeologists use tree-ring dating (dendrochronology) to determine the age of old pieces of wood.
The stratotype for this interglacial is the 'Cromer Forest Bed' situated at the bottom of the coastal cliff near West Runton (East Anglia).
The 'British' Cromerian with the rank of a stage forms part of the superstage that is known as the Cromerian Complex in Europe.
In Central Europe, the Cromerian Complex (Cromer-Komplex) is divided into three glacials and four interglacials, which are equivalent to Marine Isotope stages 13 to 21.
In the Alpine region it may also be referred to as the Günz-Mindel interglacial, the warm period between the Günz and Mindel glaciations.
Opinions of the exact correlation of British and continental Cromerian differ.
The Cromerian (s.s.) had been equated to the Aftonian in North America.
In Britain, sediments deposited during the Cromerian (s.s.) precede those of the Anglian Stage and are on top of Beestonian Stage sediments.
In the British isles several interglacials of 'Cromerian affinity' are known from this timeframe, one of these is the type Cromerian.
) or, rarely the Cromerian warm period (Kromer-Warmzeit or Cromer-Warmzeit), is a stage consisting of multiple glacial and interglacial periods in the Middle Pleistocene epoch.It is named after the East Anglian town of Cromer in England where interglacial deposits that accumulated during part of this stage were first discovered.