pnt_sym = pnt_graphic, stru_pnt and geo_pnt = stpnt_graphic, and dvalues = annotation for stru_pnt and geo_pnt.
Online Links:
| Value | Definition |
|---|---|
| Map unit | A mappable unit of geologic material as determined by the originators of this dataset. |
| Waulsortian bioherm | A type of mud mound composed of "stromatactis structures, much fibrous calcite marine cement, and few fossils." |
| Fault breccia | "A tectonic breccia composed of angular fragments resulting from the crushing, shattering, or shearing of rocks during movement on a fault, from friction between the walls of the fault, or from distributive ruptures associated with a major fault; a friction breccia." |
| Value | Definition |
|---|---|
| Qal | Alluvium (Holocene to Upper Pleistocene) |
| Qf | Alluvial-fan deposits (Holocene to Upper Pleistocene) |
| Qld | Lake deposits (Holocene to Upper Pleistocene) |
| Qrt | Rock talus (Holocene to Upper Pleistocene) |
| Qls | Landslide deposits (Holocene to Middle Pleistocene) |
| Qc | Colluvium (Holocene and Pleistocene) |
| Qg | Glacial deposits (Pleistocene) |
| Qoa | Older Alluvium (Pleistocene) |
| Qt3 | Older alluvium--Terrace gravels along Bridger Creek less than 45 m above present stream levels |
| Qt2 | Older alluvium--Terrace gravels along Bridger Creek 45-60 m above present stream levels |
| Qt1 | Older alluvium--Terrace gravels along Bridger Creek 60-90 m above present stream levels |
| Td | Mafic dike (Eocene?) |
| Ts | Composite sill (Eocene? or Paleocene?) |
| Tfnp | Fort Union Formation (Paleocene and Upper Cretaceous): Conglomerate lens at Nixon Peak (Paleocene) |
| Tfu | Fort Union Formation (Paleocene and Upper Cretaceous): Upper conglomeratic and middle sandy members, undivided (Paleocene) |
| TKfc | Fort Union Formation (Paleocene and Upper Cretaceous): Basal conglomerate member (Paleocene? and Upper Cretaceous) |
| Kh | Livingston Group (Upper Cretaceous): Hoppers Formation |
| Kbc | Livingston Group (Upper Cretaceous): Billman Creek Formation |
| Ks | Livingston Group (Upper Cretaceous): Sedan Formation |
| Ksle | Sedan Formation, Lennep Sandstone Member |
| Ksm | Sedan Formation, mudstone member |
| Ksms | Sedan Formation, middle sandstone member |
| Ksa | Sedan Formation, ash-flow tuff member |
| Ksl | Sedan formation, lower sandstone member |
| KJr | Eagle Sandstone, Telegraph Creek Formation, Cody Shale, Frontier Formation, Mowry Shale, Thermopolis Shale, Kootenai Formation, Morrison Formation, and Ellis Group, undivided (Cretaceous and Jurassic) |
| Ket | Eagle Sandstone and upper part of Telegraph Creek Formation, undivided (Upper Cretaceous) |
| Ktc | Lower part of Telegraph Creek Formation (Upper Cretaceous) |
| Kc | Cody Shale (Upper Cretaceous) |
| Kf | Frontier Formation (Upper Cretaceous) |
| Kmf | Mowry Shale, Muddy Sandstone, Skull Creek Shale, and Fall River Sandstone, undivided (Lower Cretaceous) |
| Kk | Kootenai Formation (Lower Cretaceous) |
| Jme | Morrison Formation and Ellis Group, undivided (Middle and Upper Jurassic) |
| Jm | Morrison Formation (Upper Jurassic) |
| Je | Ellis Group (Upper and Middle Jurassic) |
| PCr | Phosphoria and Quadrant Formations; Amsden , Snowcrest Range and Madison Groups; and Three Forks Formation, Jefferson Dolomite, Maywood Formation, Snowy Range Formation, Pilgrim Limestone, Park Shale, Meagher Limestone, Wolsey Shale, and Flathead Sandstone, undivided (Permian, Pennsylvanian, Mississippian, Devonian, Ordovician, and Cambrian) |
| PMps | Phosphoria and Quadrant Formations and Amsden and Snowcrest Range Groups, undivided (Permian, Pennsylvanian, and Mississippian) |
| PMpa | Phosphoria and Quadrant Formations and Amsden Group, undivided (Permian, Pennsylvanian, and Mississippian) |
| Msr | Snowcrest Range Group (Upper Mississippian) |
| MDmm | Madison Group, Three Forks Formation, Jefferson Dolomite, and Maywood Formation, undivided (Mississippian and Devonian) |
| Mmc | Madison Group (Upper and Lower Mississippian): Mission Canyon Limestone (Upper and Lower Mississippian) |
| Mlp | Madison Group (Upper and Lower Mississippian): Lodgepole Limestone (Lower Mississippian) |
| Dtm | Three Forks Formation, Jefferson Dolomite, and Maywood Formation, undivided (Upper Devonian) |
| OCsp | Snowy Range Formation and Pilgrim Limestone, undivided (Lower Ordovician and Upper Cambrian) |
| Cpf | Park Shale, Meagher Limestone, Wolsey Shale, and Flathead Sandstone, undivided (Middle Cambrian) |
| Yl | La Hood Formation of Belt Supergroup (Middle Proterozoic) |
| Wm | Metamorphic rocks (Archean) |
| fb | Fault breccia |
| w | Waulsortian bioherm |
| Value | Definition |
|---|---|
| contact | "A plane or irregular surface between two types or ages of rock. . ." not otherwise classified as a fault or other type of boundary for the purposes of this map. |
| colorboundary | A boundary other than a contact (defined above) between two map units that are shown by different colors or patterns in the cartographic product; one example is a fault contact between two map units. |
| calcite vein | A fracture containing calcite. |
| Value | Definition |
|---|---|
| 1 | accurate |
| 2 | approximate |
| 4 | concealed |
| 5 | gradational |
| Value | Definition |
|---|---|
| BEDDING SURFACE | Bedding in sedimentary rocks. |
| ASHFLOW SURFACE | Eutaxitic layering in ash-flow tuffs. |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Resolution: | 1 |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Resolution: | 1 |
| Value | Definition |
|---|---|
| 1 | inclined |
| 2 | overturned |
| 3 | horizontal (bedding in sedimentary rocks only) |
| 4 | vertical (bedding in sedimentary rocks only) |
| Value | Definition |
|---|---|
| 1 | measured |
| 2 | estimated (bedding in sedimentary rocks only) |
| Value | Definition |
|---|---|
| 1 | other (that is, other surfaces not designated as crumpled). |
| 2 | crumpled |
| Value | Definition |
|---|---|
| FAULT | Mapped faults, including normal or oblique slip faults, thrust, and detachment faults. |
| FOLD | Mapped folds, including upright and overturned anticlines and synclines. |
| Value | Definition |
|---|---|
| 1 | normal or oblique slip fault |
| 2 | thrust fault |
| 5 | detachment fault |
| 6 | queried (really an element of ACC but was included with GEOCODE; queries used on fault where fault doubtful) |
| 7 | anticline (shows crestline of fold) |
| 8 | syncline (shows troughline of fold) |
| Value | Definition |
|---|---|
| 1 | accurate |
| 2 | approximate |
| 4 | concealed |
| Value | Definition |
|---|---|
| 1 | right lateral |
| 2 | left lateral |
| Value | Definition |
|---|---|
| 1 | upright or inclined |
| 2 | overturned |
| Value | Definition |
|---|---|
| FOLIATION | Layering in metamorphic rocks. |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Resolution: | 1 |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Resolution: | 1 |
| Value | Definition |
|---|---|
| 1 | inclined |
| 4 | vertical |
| Value | Definition |
|---|---|
| 1 | measured |
| 2 | estimated (no instances mapped in this data set) |
| Value | Definition |
|---|---|
| BOUND | Quadrangle boundary |
| Xsection | Line shows the position of a cross section. |
| Value | Definition |
|---|---|
| A-A' | Line of cross section A-A' |
| B-B' | Line of cross section B-B' |
| C-C' | Line of cross section C-C' |
| Value | Definition |
|---|---|
| GRAVEL PIT | Location of gravel pit. |
| OIL TEST | Locations of Robinson Ranch no. 1 Amoco prod. and Wilsall no. 1 Statescat drilling |
| SPRING | Location of spring. |
| Value | Definition |
|---|---|
| ANTICLINE | Point that locates arrow symbol for anticline. |
| ANTI_OVER | Point that locates arrow for an overturned anticline. |
| LL/SLIP | Point that locates as arrow for left-lateral normal or oblique slip. |
| NORMAL/D | Point that locates the symbol "D" to show the downthrown side of a fault. |
| NORMAL/U | Point that locates the symbol "U" to show the upthrown side of a fault. |
| PLUNGE | Point that locates an arrow showing direction of plunge of a fold. |
| RL/SLIP | Point that locates as arrow for right-lateral normal or oblique slip. |
| SYNCLINE | Point that locates arrow symbol for syncline. |
| SYNC_OVER | Point that locates arrow for an overturned syncline. |
The geology of the Sedan quadrangle was mapped by Betty Skipp, D.R. Lageson, and W.J. McMannis; the map was converted to digital form by Techni Graphic Systems, Inc., of Fort Collins, CO, under contract with the U.S. Geological Survey, and by Nancy Shock, U.S. Geological Survey. The map was edited and the digitized product proofread by Diane E. Lane, U.S. Geological Survey.
The geology of the Sedan quadrangle was mapped as part of a regional study of the western Crazy Mountains Basin. It was digitized for ease of production of the printed version and for greater distribution for analytical use.
Are there legal restrictions on access or use of the data?Access_Constraints: None
Use_Constraints:None. Acknowledgment of the U.S. Geological Survey in products derived from these data would be appreciated.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this data set has been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the USGS as to the accuracy and functioning of the data set and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
| Data format: | ARCE (version 7.2.1) |
|---|---|
| Network links: |
http://pubs.usgs.gov/imap/i-2634/downloads/sedan.tar.gz |