Sundance Formation
E273049
The Sundance Formation is a Middle to Late Jurassic marine sedimentary rock unit in the western United States, known for its shallow sea deposits that underlie the dinosaur-rich Morrison Formation.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sundance Formation canonical | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
sedimentary rock unit ⓘ |
| age | approximately 174–163 million years ago ⓘ |
| contains |
bioturbated horizons
ⓘ
marine trace fossils ⓘ offshore marine mudstones ⓘ shoreface deposits ⓘ storm-influenced sandstone beds ⓘ tidal flat deposits ⓘ |
| containsLithology |
dolomite
ⓘ
limestone ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| depositionalSetting | shelf and nearshore marine ⓘ |
| environmentOfDeposition | shallow epicontinental sea ⓘ |
| fossilContent |
ammonites
ⓘ
belemnites ⓘ bivalves ⓘ marine invertebrate fossils ⓘ marine reptiles ⓘ |
| geologicPeriod |
Late Jurassic
ⓘ
Middle Jurassic ⓘ |
| hasStratigraphicRelationship |
conformable with underlying units in many areas
ⓘ
disconformable with underlying units in some areas ⓘ |
| isSourceOf | ammonite biostratigraphic data ⓘ |
| lithology | marine sedimentary rock ⓘ |
| locatedInRegion | western United States ⓘ |
| memberOf | Sundance Sea succession ⓘ |
| namedFor | Sundance, Wyoming ⓘ |
| overlainBy | Morrison Formation ⓘ |
| overlies |
Supai Group
ⓘ
surface form:
Chugwater Group
Gypsum Spring Formation ⓘ Nugget Sandstone ⓘ |
| paleoclimate | warm, shallow marine conditions ⓘ |
| paleogeography | deposited in the Sundance Sea ⓘ |
| partOf |
Jurassic Period
ⓘ
surface form:
Jurassic System
|
| primaryLithology |
sandstone
ⓘ
shale ⓘ siltstone ⓘ |
| stratigraphicUnitOf |
Colorado
ⓘ
Idaho ⓘ Montana ⓘ North Dakota ⓘ South Dakota ⓘ Utah ⓘ Wyoming ⓘ |
| system | Jurassic ⓘ |
| underlies | Morrison Formation ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.