2 UNION COUNTY PAST AND PRESENT
or oil flows in considerable quantities. Other springs in the
` county possess chalybeate of line quality.
Along the 36—mile shore line of the Ohio a.re the river bottoms,
a fringe of fertile fiatland. Not far from the shore the ground
p rises, then dips; and inland from these ridges is a. succession of
sloughs, ponds, and shallow lakes. Their alignment follows sub-
stantially the curving eourse of the river, into which they cannot
empty because of the higher ground nearer the river’s edge.
ln some of the sloughs and ponds the water is stagnant, in
others it is clear. Among them, Dixon and Harding Ponds and
Geiger and Morton’s Lakes are best adapted to swimming and
ln places the strip of marsh land attains a width of more than
three miles; but it narrows down to a quarter—mile at the down-
stream end, near the Crittenden County line. Several of the
sloughs hold water throughout the year. They range upward in
size from small mudholes to small lakes and their total area is
about 25,000 acres.
When the hrst settlers came to Union County, they found cane
_ growing in great abundance along the river front, furnishing a
resort for flocks of passenger pigeons, wild turkeys, geese, and
ducks, as well as for deer, otter, mink, wolves, wildcats, raccoons,
and opossums. All these. common in the days when the great
ornithologist, John James; Audubon, wandered through this
region, have now disappeared. Gone are the passenger pigeons,
once so numerous that Audubon on his way to Louisville from
Hardinshurg, in 18].3, counted 163 flocks in twenty—tl1ree minutes.
Gone. too, are the wild turkey, the prairie chicken, and the
beautiful little Carolina parralceet. But most of the songbirds
have increased enormously. These native to Kentuclay, as well as
migratory birds wliieh follow the Ohio, Mississippi, and Ten-
n<;ssc».-: Rivers are seen here in large numbers. li has been stated
by the U. S. Bureau of Biological Survey that observers in these
river valleys probably witness the passage of :1 greater number
and variety of birds than in any other river valley in the world.
Small mammals, including muskrats. squirrels, cottontails
and marsh rabbits, raceoons. and opossums, exist in surprisingly
large numbers. Occasionally mink and otter are seen.
Several species of fish of the kind common to Kentucky, such
as bass. crappie, jack salmon, and catfish are found in the lakes.
ponds. and rivers.