Editing Juniata County, Pennsylvania (section)

==Geology==
Juniata County lies over 16 different rock formations, some of which contain [[limestone]]. These rock formations come from the [[Ordovician Period]], the [[Silurian Period]], and the [[Devonian Period]]. The northernmost part of the county contains rocks of the [[Juniata Formation]], the [[Bald Eagle Formation]], and undivided Juniata and Bald Eagle formations. All of these formations primarily consist of [[sandstone]]. South of these formations lie the Bloomsburg and Mifflintown Formation undivided, the [[Clinton Group]], and the [[Tuscarora Formation]]. The first two of these consist mainly of [[shale]], while the third is composed of [[quartzite]]. The rock formations in the southwestern part of the county include the Brallier and Harrell Formations undivided, the [[Hamilton Group]], the Irish Valley member of the [[Catskill Formation]], and others. The eastern part of the county lies almost entirely over the Hamilton Group, the Tuscarora Formation, and the Irish Valley member of the Cataskill Formation.<ref name = "chapter02"/>

Other rock formations found in Juniata County include the Keyser through Mifflintown Formation undivided, the Keyser and Tonoloway Formation undivided, the Onondaga and Old Port Formations undivided, the [[Reedsville Formation]], the [[Trimmers Rock Formation]], the [[Wills Creek Formation]], and the Wills Creek Formation through Mifflintown Formation undivided.<ref name = "chapter02"/>

Four of the rock formations found in Juniata County come from the Ordovician Period, seven come from the Silurian Period, and seven come from the Devonian Period.<ref name = "chapter02"/>

There are seven soil associations in Juniata County. One of these is the Hazelton-Laidig-Buchanan Association. It is a deep and fairly well-drained soil that is found in 24% of the county. It is mostly found in the county's forested areas. The Berks-Weikert-Bedington Association is also found in the county. It is found in 33% of the county's area and is not as deep as the Hazelton-Laidig-Buchanan Association, but is well-drained. The soil is mostly found in agricultural lands and some forested areas. Another soil association in the county is the Edon-Opequon-Weikert Association, which is a well-drained soil that occupies 17% of the county. The Elliber-Kreamer-Mertz Association is a deep and well-drained soil that makes up 12% of the county. The Chenango-Pope-Holly Association and the Morrison-Hazelton-Clymer Association make up 7% and 6% of the county, respectively. They are both deep and occur on gentle slopes. However, the former is poorly drained, while the latter is well-drained. The Hazelton-Laidig-Buchanan Association is well-drained and makes up 1% of the county's area.<ref name = "chapter02"/>

There are 51 different soil types in Juniata County, of which 18 are considered prime farmland. There are few agricultural soils on the northern and southern edges of the county.<ref name = "chapter02"/>

The main rock formations in the boroughs of Mifflin and Mifflintown are the undivided Keyser and Tonoloway Formations and the Irish Valley Member of the Catskill Formation. The same rock formations are found in the borough of Port Royal, along with the Clinton Group and the Hamilton Group to the northwest and southeast of the borough, respectively. The Hamilton 
Group, the Keyser and Tonoloway Formations, and the Irish Valley Member of the Catskill Formation are found in or near the borough of Thompsontown.<ref name = "chapter02"/>