- Usage in publication:
-
- Marburg Formation*
- Modifications:
-
- Reinstated
- Revised
- Age modified
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Marburg Schist of Jonas and Stose (1938) is here reinstated as Marburg Formation. Fisher (1978) abandoned Marburg and included its rocks within Ijamsville Phyllite. Ijamsville is distinctive purple phyllite, whereas the Marburg is a lithologically mixed unit and therefore is reinstated as a separate, mappable unit. Rank term is changed to Formation because it consists predominantly of phyllite, paragonite phyllite, muscovite phyllite, siltstone, greenstone, quartzite, and graywacke. It also now includes some rocks previously called Pleasant Grove Schist (here abandoned), because it has been determined that Pleasant Grove was composed of sheared Mather Gorge Formation, Prettyboy Schist, and Marburg Formation. Age of Marburg is changed to Late Proterozoic and Early Cambrian.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).