CRAWFORD COUNTY. 239 



sometimes untillable by reason of poor drainage. The soil is here made 

 up largely of organic matters in process of decay. The county originally 

 was mostly covered with a deciduous forest. The prairies, even, in Dal- 

 las and Whetstone townships, have some small oaks and hickories scat- 

 tered through them on knolls of coarser Drift that rise above the com- 

 mon fiat. 



The following varieties of timber were observed in traveling over the 

 county. This list can not be regarded as complete, but embraces the 

 most prominent varieties : 



Oak — Quercus alba (White Oak) L. 



palustris (Pin Oak) DuRoi. 



bicolor (Swamp White Oak) Willd. 



Castanea (Chestnut Oak) Willd. 



prinoides (Chinquapin) Willd. 



rubra (Red Oak) L. 



Beech — Fagus ferruginea Ait. 



Sugar Maple — Acer saocharinum Wang. 



Cottonwood — Populus monilifera Ait. 



Elm — Ulmus Americana Willd. 



Black Cherry — Prunus serotina Ehr. 



Butternut — Juglans cinerea L. 



Black Walnut— Juglans nigra L. 



Shagbark Hickory- — Carya alba Nutl. 



Tulip Tree — Liriodendron tulipifera L. 



Pepperidge — Nyssa multiflora Wang. 



Buckeye — JEsculus glabra Willd. 



White Ash — Fraxinus Americana L. 



Swamp Maple — Acer rubrum L. 



Sassafras — Sassafras officinale Nees. 



Basswood — Tilia Americana L. 



Sycamore — Platanus occidentalis I). 



Ironwood — Ostrya Virginica Willd. 



Blue Beech — Carpinus Americana Michx. 



Honey Locust — Gleditschia triacanthos L. 



Aspen — Populus tremuloides Michx. 



Willow — Salix nigra (tree a foot in diameter ; wet places ; leaf small, 



lance-linear) Marsh. 



Chestnut— Castanea vesca (in Auburn township, Sec. 10, and spar- 

 ingly at Leesville and Galion) L. 



Thorn — Crataegus coccinea L. 



GEOLOGICAL STRUCTURE. 



The strike of the formations is north and south across the county, the 

 dip being toward the east. The rocks of the county pertain to the 



