FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1549853770> ?p ?o ?g. }

• W1549853770 endingPage "699" @default.
• W1549853770 startingPage "676" @default.
• W1549853770 abstract "ABSTRACT Permian-Triassic strata of the Middle Rocky Mountains (Wyoming, southern Montana, eastern Idaho, northeastern Utah, and northern Colorado) reflect major subsidence in the miogeosyncline on the west and minor subsidence of the shelf to the east. Sequences of thousands of feet of strata in southeastern Idaho and northern Utah give way eastward to sequences a few hundred feet thick. Western areas were sites of deposition of Permian phosphorite, chert, and dark mudstone (Phosphoria Formation), and of Triassic olive shale, tan siltstone, and grey limestone (Dinwoody Formation). A broadly comparable west-to-east transition from normal marine to hypersaline environment characterizes both systems, with red beds dominating in eastern Wyoming. Stratification is generally parallel on each side of the contact, and the only evidence of pre-Triassic erosion is commonly microrelief on a generally flat surface of great extent. The specific boundary between the two systems at any one locality is placed primarily on lithologic evidence. A change from carbonate to fine-grained, land-derived sediment characterizes the contact through much of Wyoming. To the east, red beds and evaporites are overlain by similar red beds and evaporites; to the west, each of the several Phosphoria Formation rock types or equivalent Shedhorn Sandstone can be found directly below Triassic shale and calcareous siltstone. The Upper Permian strata commonly show silicification, whereas Lower Triassic beds do not. Bedded evaporite commonly occurs in drab Lower Triassic strata of the shelf, whereas it is limited to the Permian red-bed sequence in peripheral regions of the shelf. Faunal control normally either confirms the boundary (western area), is absent above the boundary (central shelf), or is absent above and below it (eastern shelf). Youngest Permian faunas generally indicate a Guadalupian age, although a small collection of brachiopods from northwestern Wyoming suggests the possibility of post-Guadalupe Permian beds. The thick Triassic sequence in Idaho contains several Lower Triassic ammonoid zones, starting with a late Otoceratan assemblage. Upper Permian and Lower Triassic strata contrast strikingly in diversity and abundance of fossils. Groups common in Permian strata but absent in Lower Triassic beds include sponges, bryozoans, productoids, seven bivalve superfamilies, and scaphopods. Over the shelf, the youngest Permian strata were deposited in sublittoral to supralittoral carbonate and evaporite environments. This area was probably sub-aerially exposed before deposition of basal Dinwoody strata but remained nearly at sea level. Erosion, dissolution, and soil formation were minimal, probably reflecting arid climate and lack of relief. To the west, deposition may have persisted in some localities during much or all of this time. Triassic strata indicate a westward shift of environments so that deposition of carbonate rocks prevailed in the miogeosyncline and high salinity prevailed farther west on the shelf than in Permian seas. End_Page 676------------------------" @default.
• W1549853770 created "2016-06-24" @default.
• W1549853770 creator A5050148146 @default.
• W1549853770 creator A5063541752 @default.
• W1549853770 date "1972-12-01" @default.
• W1549853770 modified "2023-09-23" @default.
• W1549853770 title "Permian-Triassic Boundary in the Middle Rocky Mountains" @default.
• W1549853770 doi "https://doi.org/10.35767/gscpgbull.20.4.676" @default.
• W1549853770 hasPublicationYear "1972" @default.
• W1549853770 type Work @default.
• W1549853770 sameAs 1549853770 @default.
• W1549853770 citedByCount "4" @default.
• W1549853770 countsByYear W15498537702012 @default.
• W1549853770 crossrefType "journal-article" @default.
• W1549853770 hasAuthorship W1549853770A5050148146 @default.
• W1549853770 hasAuthorship W1549853770A5063541752 @default.
• W1549853770 hasConcept C109007969 @default.
• W1549853770 hasConcept C122792734 @default.
• W1549853770 hasConcept C127313418 @default.
• W1549853770 hasConcept C146588470 @default.
• W1549853770 hasConcept C151730666 @default.
• W1549853770 hasConcept C153127940 @default.
• W1549853770 hasConcept C180851071 @default.
• W1549853770 hasConcept C186660238 @default.
• W1549853770 hasConcept C187359657 @default.
• W1549853770 hasConcept C19320362 @default.
• W1549853770 hasConcept C2778537970 @default.
• W1549853770 hasConcept C2779650180 @default.
• W1549853770 hasConcept C34221334 @default.
• W1549853770 hasConcept C50050167 @default.
• W1549853770 hasConcept C6494504 @default.
• W1549853770 hasConcept C83365034 @default.
• W1549853770 hasConcept C85124164 @default.
• W1549853770 hasConceptScore W1549853770C109007969 @default.
• W1549853770 hasConceptScore W1549853770C122792734 @default.
• W1549853770 hasConceptScore W1549853770C127313418 @default.
• W1549853770 hasConceptScore W1549853770C146588470 @default.
• W1549853770 hasConceptScore W1549853770C151730666 @default.
• W1549853770 hasConceptScore W1549853770C153127940 @default.
• W1549853770 hasConceptScore W1549853770C180851071 @default.
• W1549853770 hasConceptScore W1549853770C186660238 @default.
• W1549853770 hasConceptScore W1549853770C187359657 @default.
• W1549853770 hasConceptScore W1549853770C19320362 @default.
• W1549853770 hasConceptScore W1549853770C2778537970 @default.
• W1549853770 hasConceptScore W1549853770C2779650180 @default.
• W1549853770 hasConceptScore W1549853770C34221334 @default.
• W1549853770 hasConceptScore W1549853770C50050167 @default.
• W1549853770 hasConceptScore W1549853770C6494504 @default.
• W1549853770 hasConceptScore W1549853770C83365034 @default.
• W1549853770 hasConceptScore W1549853770C85124164 @default.
• W1549853770 hasIssue "4" @default.
• W1549853770 hasLocation W15498537701 @default.
• W1549853770 hasOpenAccess W1549853770 @default.
• W1549853770 hasPrimaryLocation W15498537701 @default.
• W1549853770 hasRelatedWork W1499400039 @default.
• W1549853770 hasRelatedWork W1548820383 @default.
• W1549853770 hasRelatedWork W1598354175 @default.
• W1549853770 hasRelatedWork W1993628991 @default.
• W1549853770 hasRelatedWork W2025220757 @default.
• W1549853770 hasRelatedWork W2032168818 @default.
• W1549853770 hasRelatedWork W2043738956 @default.
• W1549853770 hasRelatedWork W2055897802 @default.
• W1549853770 hasRelatedWork W2082320866 @default.
• W1549853770 hasRelatedWork W2099146974 @default.
• W1549853770 hasRelatedWork W2128561164 @default.
• W1549853770 hasRelatedWork W2146346223 @default.
• W1549853770 hasRelatedWork W2151138206 @default.
• W1549853770 hasRelatedWork W2154208178 @default.
• W1549853770 hasRelatedWork W2161886573 @default.
• W1549853770 hasRelatedWork W2170479132 @default.
• W1549853770 hasRelatedWork W2187639440 @default.
• W1549853770 hasRelatedWork W2262255190 @default.
• W1549853770 hasRelatedWork W2323695860 @default.
• W1549853770 hasRelatedWork W2903731627 @default.
• W1549853770 hasVolume "20" @default.
• W1549853770 isParatext "false" @default.
• W1549853770 isRetracted "false" @default.
• W1549853770 magId "1549853770" @default.
• W1549853770 workType "article" @default.