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| Abstract |
- Paleozoic dolomites, limestones, and detrital clastic rocks
were mapped in the Bellevue Peak 15 minute quadrangle in the
southern Mahogany Hills, Nevada. Sedimentary rock units in this
area represent shallow-shelf eastern assemblage deposits.
Shallow-shelf carbonates characterized deposition from at
least Ordovician through Late Devonian time, when clastics derived
from the Antler orogenic belt overwhelmed the previous environments.
The Ordovician Eureka Quartzite, a quartz arenite of unknown
thickness in the map area, probably represents a beach-bar-dune
environment. The superjacent Hanson Creek Formation comprises
limestones and dolomites of probable Late Ordovician-Early Silurian
age and represents a semi-restricted lagoonal environment. Total
thickness of this unit in the map area is unknown. Above the interval
black dolomites which was chosen as the top of the Hanson Creek, are
light-colored dolomites which are assigned to the Lone Mountain
Dolomite. These deposits are generally coarse-grained, recrystallized,
and lack primary structures. An abrupt contact, interpreted
as an unconformity, marks the top of this formation. Extremely
fine-grained, largely unfossiliferous, light grey dolomites of the
Beacon Peak Dolomite (107 m thick) overlie the Lone Mountain
Dolomite in the eastern part of the map area. To the west, bioclastic
limestones and dolomites of the Mc Colley Canyon Formation (155 m
thick) overlie the Lone Mountain Dolomite. The Beacon Peak
Dolomite and the Mc Colley Canyon Formation are thought to be
lateral equivalents in this area, with the Beacon Peak having been
deposited in a supratidal environment and the Mc Colley Canyon in
a subtidal, normal-marine environment. Progressive deepening
resulted in an eastward shift of these facies during the late Early
Devonian. Evidence of shoaling is present in the crinoidal dolomites
of the Sadler Ranch Formation (137 m thick). This shoaling continued
and resulted in the westward incursion of a tongue of the upper
Oxyoke Canyon Sandstone (21 m thick) during the early Middle
Devonian. Deepening of the carbonate shelf is again evident in the
eastward retreat of the high-energy Oxyoke Canyon Sandstone environment
and the initiation of shallow-water, Middle Devonian
Simonson Dolomite (396 m thick) deposition in the map area. The
superjacent Devils Gate Limestone represents increased water depth
and enhanced circulation over the depositional platform. This shallow
water carbonate environment persisted until detrital clastics from
the Antler orogenic belt, to the west, terminated carbonate deposition
in the map area.
The presence of basinal deposits of the Roberts Mountains
Formation and the Denay Limestone, 10 kilometers northwest of the
map area at Lone Mountain, indicates that the shelf-slope break
probably persisted west of the map area from at least the Late
Silurian through the Middle Devonian. The stratigraphic sequence
in the map area is typical for the area near Eureka, Nevada.
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| Digitization Specifications |
- File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Plates: Master map file scanned at 600 dpi, 24-bit color on a Paradigm ImagePRO GxT 42 HD (OEM version of ColortracSmartLF Bx 42). Image manipulated by SmartLF1.3.05.
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| Additional Information |
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Previous issue date: 1978-02-10
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