Surficial and Bedrock Geology of the Northern Portion of the U.S.G.S. 1:100,000 Scale Crestview Quadrangle, Northwestern..

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The near surface geology of the northern portion of the U.S.G.S.
1:100,000 scale Crestview quadrangle is both simple and complex in
nature. As part of the structurally uneventful Eastern Gulf Coastal
Plain, the region consists of gently dipping, generally unconsolidated
sequences of Oligocene to Pleistocene sediments. Physiographically, it
is comprised of gently sloping Neogene fluvio-deltaic siliciclastics of
the Western Highlands, terraced Pleistocene-Holocene siliciclastics of
the Gulf Coastal Lowlands, and various floodplains. Several relict
Neogene coastal terraces and ridges have been recognized in the
study area (Healy, 1975). Surface topography has been deeply
incised, resulting in some impressive relief that is uncharacteristic of
most Floridan landscapes. Florida's highest elevation is located within
the study area in northern Walton County at 345 feet (105.2 meters)
above sea level. Some karst influence is evident in western Holmes
County and northeastern Walton County and is expressed as


Due to the occurrence of Quaternary sediments and soils located
at the surface in this study area, the authors adopted the policy of
mapping the first named geologic unit within twenty feet (6.1 meters)
of the surface. If Quaternary sediments were more than twenty feet
(6.1 meters) thick, then they appear as the surface mapped unit. In
areas where the Quaternary sediments are less than twenty feet (6.1
meters) thick, the underlying stratigraphic unit was mapped.
The oldest unit encountered in this study is the Bridgeboro
Limestone. Within the study area, this unit occurs entirely in the
subsurface. It is penetrated in wells east of the Yellow River and is
generally encountered at 60 feet (18.3 meters) above sea level in the
northeast and dips less than one degree in a southwesterly direction.
This gentle southwesterly dip is the regional trend for all stratigraphic
units above the Bridgeboro Limestone in the study area. Some
irrniilnritv yisfts in this trenl nnda mnv ho Abnlnind hv


Alum Bluff Group sediments are mapped at the surface along
the length of the Shoal River and in areas of the easternmost portion
of the study area where surface elevations are below 150 feet (45.7
meters). The classic exposure near Oak Grove, referred to as Oak
Grove Sand by Huddlestun (1984), on the Yellow River in north-central
Okaloosa County, is the western most outcrop of Alum Bluff Group
sediments. Here the lithology consists of a well-preserved molluscan
shell bed containing sand, mica and traces of heavy minerals.
However, this unit is not known to crop out anywhere else and
available core data is not sufficient to trace the unit laterally. Along
the Shoal River, numerous outcrops of micaceous, slightly argillaceous,
silty, fine to medium quartz sand with some beds containing numerous
fossil molluscs, occur. The Shoal River Formation outcrop is restricted
to the Shoal River basin and cannot easily be traced in the
subsurface. Thus. for the purpose of this map. these units are not


Undifferentiated Clastic Sediments and the Choctawhatchee Formation
of the Alum Bluff Group, and the Ecor Rouge Sand of southern
Alabama (Isphording, 1977). MacFadden and Dobie (1998) have
described fossil horse remains (Protohipp, s gicUeyi) from the Ecor
Rouge Sand near Mobile, Alabama, indicating a Late Miocene age for
that formation. Terrestrial vertebrate fossil remains are also known
from the Alum Bluff Group near De Funiak Springs. Additional work
may refine the age and facies relations of the Alum Bluff Group and
the Undifferentiated Clastic Sediments of the western Florida panhandle.
Siliciclastic sediments of the Citronelle Formation disconformably
overlie the Undifferentiated Clastic Sediments in the western portion of
the study area and the Alum Bluff Group in the east. The Citronelle
Formation occurs throughout the entire study area and is found at
elevations of 150 feet (45.7 meters) or more above sea level. The
formation contains numerous clay strinaers and limonitic hardoans that


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