Fossils and Soil layers
trilobite
A crablike invertebrate that is the most common fossil of the Cambrian Period
fossil
A trace of an ancient organism that has been preserved in rock.
bivalve
An organism with two shells
subsoil
B horizon with low humus,high minerals
weathered rock
C horizon with little or no plant or animal life
belemnite
Cone shaped shell, related to a squid
bedrock
D horizon a solid layer of rock beneath the soil
sedimentary rocks
Fossils are found almost exclusively in...
palaeontology
The study of fossils
illuviation
deposit of leached material in lower soil layers; B horizon
crinoid
feather stars
brachiopod
lamp shells that look like clams but aren't
ammonite
marine predators
humus
material formed from decaying leaves and other organic matter
leaching
removal of dissolved materials from soil by water moving downwards through soil.
echinoid
sea urchins and sand dollars
topsoil
the A layer of soil that is a mixture of humus,clay and minerals
