Wirral Part 4 - National Museums Liverpool

Appendix 2 Broad Periods
These are the historic Broad Periods standardised within the project. They primarily
equate to those used in the Historic Environment Record, but slightly revised to take
into account the use of Ordnance Survey digital map Epochs).
Medieval 1066-1539
Post-Medieval 1540-1750
Industrial Revolution 1. 1751-1835
Industrial Revolution 2. 1836-1900
Early Twentieth Century. 1901-1917
Inter War 1918-1939
Later Twentieth Century. 1946-2000
Twenty First Century. 2001-2050
Broad Period use within the data capture and report presentation - purely a tool which
enabled broad date searches i.e. to map and illustrate landscape changes through
time, assign periods for information outside the historic map base periods set for the
project. It provides a purely qualitative 'snap-shot' of each district (or a particular part
of a district) relative to the Current mapping. In essence, the broad period mapping is
a 'period of origin' assessment on the Current mapping.
The broad period mapping allows for a quick, entirely broad-brush assessment of the
survival and continuance of certain character types (notably historic cores, field
systems).The default setting (within the database) should be the Industrial Revolution
2 (1836 to 1900) period, as this is the earliest period to which sites can reliably be
dated (1850 was the earliest digital historic map source used within the project
database). Assigning a ‘Broad Period’ has been particularly useful for landscape
types that post-date 1939, because the project only used historic map sources
available up to 1939 (then the Current 2003 map source).
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