Juana Lopez Member

Juana Lopez Member
Stratigraphic range: Turonian
Juana Lopez Member near its reference section south of Cuba, New Mexico
TypeMember
Unit ofMancos Shale (San Juan basin)
Carlile Formation (Denver and Raton Basins)
Benton Shale (North Park Basin)
UnderliesNiobrara Formation
OverliesCodel Sandstone member of the Carlile
Thickness140 feet (43 m)
Lithology
PrimarySandstone with abundant carbonate fossil grains
OtherGravel, Codel fragments
Location
Coordinates35°29′12″N 106°12′04″W / 35.4866°N 106.2010°W / 35.4866; -106.2010
Country United States
Type section
Named forMesita Juana Lopez Grant, six miles northwest of Los Cerrillos, New Mexico
Named byRankin
Year defined1944
Juana Lopez Member is located in the United States
Juana Lopez Member
Juana Lopez Member (the United States)
Juana Lopez Member is located in New Mexico
Juana Lopez Member
Juana Lopez Member (New Mexico)

Juana Lopez refers to both the uppermost member of the Carlile Shale formation and to the environment that caused it to form. The Juana Lopez Member is calcareous sandstone dated to the Turonian age of the Upper Cretaceous and is exposed in the southern and western Colorado, northern and central New Mexico,[1] and northeastern Utah.[2] The unit has been described as "the most enigmatic" member of the Carlile Shale.[3]

  1. ^ Lewis, Russell K. (2013), Stratigraphy and depositional environments of the Late Cretaceous (Late Turonian) Codell sandstone and Juana Lopez members of the Carlile shale, southeast Colorado, Mines Theses & Dissertations, retrieved 2018-08-14
  2. ^ Molenaar, C.M.; Cobban, W.A. (1991). "Middle Cretaceous stratigraphy on the south and east sides of the Uinta Basin, northeastern Utah and northwestern Colorado". United States Geological Survey Bulletin. 1787-P. doi:10.3133/b1787P.
  3. ^ Lewis 2013.