These are the most frequently used words in this book.
age
area
ashes
base
basin
beds
between
black
britain
called
cambrian
carboniferous
caused
chalk
chapter
clay
coal
contain
continental
cretaceous
devonian
during
early
east
end
england
epoch
famous
fault
fig
fold
followed
form
formation
formed
fossils
found
further
glacial
granite
great
group
highlands
hills
ice
jurassic
km
lake
land
late
lavas
level
limestone
lower
ma
major
marine
may
middle
midland
million
mountains
movements
north
northern
now
occur
ocean
often
old
ordovician
orogeny
part
period
permian
probably
red
rocks
sands
sandstone
scotland
sea
sediments
sequence
shales
show
silurian
south
southern
tertiary
thick
time
two
upper
valley
volcanic
wales
water
years
zone