According to Bennison, most of Montgomery County is covered by limestones, sandstones and shales deposited during the Pennsylvanian Period, about 300 million years ago.
(most of Montgomery County; is covered; by limestones, sandstones and shales) (limestones, sandstones and shales; deposited; T:during the Pennsylvanian Period; T:about 300 million years ago)
most of Montgomery County limestones, sandstones and shales
is covered deposited
by limestones, sandstones and shales
T:during the Pennsylvanian Period T:about 300 million years ago