REPORT OF INVESTIGATIONS No. 40


 PREVIOUS WORK
 The earliest published report that describes the water resources of
Escambia and Santa Rosa counties was by Sellards and Gunter (1912);
it discusses the water supply of west-central and west Florida. This
report describes the physiography, drainage, water wells, and soils of
Escambia and Santa Rosa counties. It contains information, on wells in
Santa Rosa County at Bagdad, Blackman, Cobb, Milligan, Milton, Mulat,
Pace, and Robinson Point. Data are supplied for wells in Escambia
County at Cantonment, Bohemia, Molino, Muscogee, Pine Barren, Mc-
David and Pensacola, including chemical analyses of water from several
of these wells. The report also contains a map (p. 95) showing areas
of artesian flow in the two counties.
 The following year (1913) Matson and Sanford published a report
on the geology and ground water of the entire State. They briefly de-
scribe the physiography, geology, and water supply of Escambia and
Santa Rosa counties (p. 301-304; 401-403). Data on typical wells and
general information on water resources of selected towns are tabulated
for each of the two counties.
 Streamflow records have been collected on the Escambia River since
1934, on Big Coldwater Creek since 1938, and on the Perdido River
since 1941. Daily records of flow for these rivers are published by the
U.S. Geological Survey in the annual series of water-supply papers.
 The first detailed investigation of ground water in the area was made
by Jacob and Cooper (1940). The report contained a section on geology
by Sidney A. Stubbs. The study included pumping tests of both the
drawdown type and the recovery type to obtain coefficients of trans-
missibility and storage for the aquifer in the vicinity of Pensacola. Since
1940, continuous and periodic measurements have been made of the
water levels in wells as far north as Cantonment to determine the effect
of rainfall, pumping, barometric pressure, and tides. Jacob and Cooper
also had chemical analyses made of water from several wells and
studied the encroachment of salt water from Bayou Chico into wells of
the Newport Industries and of the U.S. Navy.
 The mineral spring at Chumuckla in Santa Rosa County is briefly
 described by Ferguson, Lingham, Love, and Vernon (1947) in their
 report on the springs of Florida.
 Heath and Clark (1951) made a detailed investigation of the poten-
 tial yield of ground water in the vicinity of Gulf Breeze on Fair Point
 Peninsula, Santa Rosa County. Twenty test wells were drilled across the
 peninsula, and periodic water-level measurements were made to obtain