Pages authored by Carl B. Rexroad:

1. Watershed Hydrology / Spring Mill Lake Contamination
   Spring Mill State Park is located near the town of Mitchell, Lawrence County, in south-central Indiana. The park has a variety of historical and natural attractions such as the restored pioneer village and interesting caves and is visited by nearly three-quarters of a million people each year.
2. Rock Unit Names / Borden Group
   Type locality, names, and reference sections: The name Borden Series was proposed by Cumings (1922, p. 487) to replace the older non geographic term Knobstone.
3. Rock Unit Names / Brassfield Limestone
   Type section and use of name in Indiana: The Brassfield Limestone was named by Foerste (1906, p. 18, 27) for exposures along the now-abandoned Louisville and Atlantic Railroad between Brassfield and Panola in Madison County, east-central Kentucky.
4. Rock Unit Names / Cataract Formation
   Type locality and use of name: The Cataract Formation was named by Schuchert (1913) for a part of what was commonly called the Medina Sandstone at Niagara Fails.
5. Rock Unit Names / Rockford Limestone
   Type section and synonyms: The first written reference to the “Goniatite limestone of Rockford” was by Owen and Norwood (1847, p. 5).
6. Ancell Group / St. Peter Sandstone
   Type section and use of name: The St. Peter Sandstone was named by Owen (1847, p. 169-170) for the exposures along the river then called St. Peter (now the Minnesota River) in southern Minnesota.
7. Blue River Group / Ste. Genevieve Limestone
   Type locality and history of name in Indiana: The Ste. Genevieve Limestone was named by Shumard (1860, p. 406; 1873, p. 293-294) for exposures in the bluff of the Mississippi River south of Ste. Genevieve, Mo.
8. Borden Group / Edwardsville Formation
   Type section and use of name: The Edwardsville Formation was named by Stockdale (1931, p. 220) for Edwardsville, Floyd County, Ind. The type section is along former Indiana Highway 62 a short distance northeast of the town near the center of the NE¼ sec.
9. Borden Group / New Providence Shale
   Type locality and use of name: The name New Providence Shale was used by Borden (1874) for 80 to 100 feet (24 to 30 m) of shale “at the base of the knobs and immediately above the ferruginous [Rockford] limestone.”
10. Borden Group / Spickert Knob Formation
    Type and reference sections and use of name: The Spickert Knob Formation was named by Rexroad and Lane (1984) for exposures in Floyd County, Ind., near Spickert Knob along Spickert Knob Road and adjacent gullies to the northeast. This is Stockdale's section 16 (1931, p. 115), which is in the NE¼ sec. 21 and SE¼ sec.
11. Edwardsville Formation / Floyds Knob Limestone Member
    Type section and use of name: The Floyds Knob Limestone Member was originally named as a formation for exposures along U.S. Highway 150 through the Knobstone Escarpment at Floyds Knobs in the center of sec. 21, T. 2 S., R. 6 E., three-fourths of a mile east of Floyds Knobs post office in Floyd County, Ind.
12. Brassfield Limestone / Lee Creek Member
    Type section and use of name: The Lee Creek Member of the Brassfield Limestone was named by Nicoll and Rexroad (1968, p. 9) for the very dolomitic upper part of the Brassfield in southeastern Indiana and adjacent Kentucky.
13. Cataract Formation / Cabot Head Member
    Type locality and use of name: The Cabot Head was originally named by Grabau (1913) “the Cabots Head beds” for exposures at Cabots Head on Manitoulin Island in northern Lake Huron, Ontario.
14. Cataract Formation / Manitoulin Dolomite Member
    Type locality and use of name: The Manitoulin Dolomite Member of the Cataract Formation was named by Williams (1913) because of its importance on Manitoulin Island in the northern part of Lake Huron, Ontario. There it underlies the Cabot Head Shale, although in places the two are also in a facies relationship.
15. Cataract Formation / Stroh Member
    Type section: The Stroh Member of the Cataract Formation was named by Rexroad (1980) for Stroh, Steuben County, in extreme northeastern Indiana. The type section consists of the rocks penetrated by the Northern Indiana Public Service Co. Arden Tubbs No. 1 well in the SW¼SE¼SW¼ sec.
16. Salamonie Dolomite / Osgood Member
    Type area, reference sections, and use of name: The term Osgood Beds was applied by Foerste (1896, p. 191) to the fossiliferous lower part of what was then called the Laurel Formation near Osgood in Ripley County, Ind. A type section was not designated, and the member is not now well exposed in the Osgood area.
17. Sanders Group / Ramp Creek Formation
    Type and reference sections and history of name: The name Ramp Creek Member was given by Stockdale (1929b, p. 240) to a part of his Lower Harrodsburg Limestone. The name was later modified by Smith (1965) to “Ramp Creek Limestone Member” and assigned to the Muldraugh Formation.
18. Sanders Group / Salem Limestone
    Type locality and use of name: The name Salem Limestone was proposed by Cumings (1901) to replace the preoccupied name Bedford Limestone for rocks lying between the Harrodsburg Limestone (below) and the Mitchell Limestone (above).
19. Harrodsburg Limestone / Guthrie Creek Bed
    Type section and use of name: The Guthrie Creek was named as a member of the lower part of the Harrodsburg Limestone by Stockdale (1929b, p. 240) but was reduced to the rank of a bed by Nicoll and Rexroad (1975, p. 9).
20. Salem Limestone / Somerset Shale Member
    Type locality and use of name in Indiana: The name Somerset Shale Member was given by Butts i 1922, p. 89, 104-107) to an upper part of the Warsaw Formation in Kentucky. The name was derived from Somerset in Pulaski County, although Butts indicated that the unit was better exposed in glades about 2 miles (3.2 km) southwest of Colesburg.