The
coloured bars refer to the different units in the Manx Group shown
on the Geological Map.
The ranges of the bars indicate the proportion of sandstone and mudstone
as well as the relative thicknesses of the beds in these rock units.
Unit names and ages are shown in the key to the map. (mya = million
years ago.)
Key
to colours on bars and map
Barrule and Glen Rushen units,
481 and 477 mya
Maughold
unit,
482 mya
Maughold
unit
(inc.quartz sandstones and pebbly mudstones), 482 mya
Injebreck unit (inc. pebbly
mudstones),
480 mya
Maughold
unit,
482 mya
Glen
Dhoo unit,
488 mya
Creggan
Mooar unit,
475 mya
Lonan
unit,
486 - 484 mya
Maughold
unit
(inc, quartz sandstones), 482 mya
Port
Erin/Lonan unit (incl. quartz sandstones),
485 - 484 mya
Injebreck
unit
(incl. quartz sandstones and pebbly mudstone), 480mya
Glion
Cam unit
(brown sandstones), 490 mya
Lady
Port unit
(incl. brown sandstones and pebbly mudstones), 472 mya
Creg
Agneash& Mull Hill units
(quartz sandstones), 483 mya
