OHIO GENEALOGY EXPRESS - Mahoning Co., Ohio

20th Century History of
Youngstown & Mahoning Co., Ohio
and Representative Citizens - Publ. Biographical Publ. Co.
Chicago, Illinois - 1907
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CHAPTER I.
GEOLOGY
Geological Structure of the State - The Geological Foundations of Ohio of Marine Origin Prehistoric Conditions - First Land Plants: Origin of Coal Fields - First Permanent Dry Land - Age of Reptiles: First Mammals - The Glacial Period - Effect of Glacial Action on the Landscape - Surface Features of Mahoning County - Geological Structure of Mahoning County Conglomerate - Fossil Nuts and Fruits of the Carboniferous Age Found in Mahoning County.
Pg. 21

THE GEOLOGICAL FOUNDATIONS OF OHIO OF MARINE ORIGIN.

PREHISTORIC CONDITIONS.

FIRST LAND PLANTS, ORIGIN OF COAL FIELDS.

FIRST PERMANENT DRY LAND.

AGE OF REPTILES: FIRST MAMMALS.

THE GLACIAL PERIOD.

EFFECT OF GLACIAL ACTION ON THE LANDSCAPE.

SURFACE FEATURES OF MAHONING COUNTY.

GEOLOGICAL STRUCTURE OF MAHONING COUNTY.

CONGLOMERATE.

FAMOUS COAL OF MAHONING COUNTY.

FOSSIL NUTS AND FRUITS OF THE CARBONIFEROUS AGE, FOUND IN MAHONING COUNTY.

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