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![Fig. 2.]()
![Fig. 1.]()
![Measured stratigraphic sections from Twilight Creek and Abbott River showing lithology, age, fossil control, and position of events discussed in text. Solid dots represent horizons with biostratigraphically useful graptolites, open dots represent horizons with radiolarian recovery. Graptolite zones shown are those recognized in the Arctic (Melchin 1989; Lenz and Melchin 1990; Lenz 1995). Dashed lines show positions of extinction and diversification events referred to in text. Section thicknesses in metres. Stratigraphic columns from Noble and Lenz (unpublished data, 1998).]()
![Lithologic column and selected geochemistry of the Twilight Creek Section, Bathurst Island. Dashed lines show the positions of the Ireviken, C. lundgreni, and Co. ludensis Extinction Event boundaries referred to in text. Graptolite Zonal abbreviations: greiston., M. griestonensis; sak., C. sakmaricus; du.-pra., P. dubius – G. nassa and Co. praedeubeli – Co. deubeli; lu., Co. ludensis. Hom., Homerian; l., lower; u., upper. TOC, total organic carbon; VPDB, Vienna Pee-Dee Belemnite.]()
![Figure4—Twilight Creek (east and west valley-side sections), Humphries Hill and Hoved Island sections; all graptolites are preserved as flattened films on shale or siltstone]()
![First thumbnail for: A new Gorstian radiolarian fauna from the upper Si...]()
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![Third thumbnail for: A new Gorstian radiolarian fauna from the upper Si...]()
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![Second thumbnail for: Early Silurian (Wenlockian) δ 13 C profiles from t...]()
![Third thumbnail for: Early Silurian (Wenlockian) δ 13 C profiles from t...]()
![Figure1—Section location map. 1, Snowblind Creek; 2, Abbott River; 3a, b, Twilight Creek, east and west valley sections, respectively; 4, Humphries Hill; 5, Hoved Island; 6, Cape Sir John Franklin. The dashed line marks the approximate boundary between the shelf platform (east), and the basin-margin and basin (west of the line)]()
![Fig. 1.]()
![Inset map at top left showing location of study area within the Arctic Islands. Map showing paleogeography of the Cape Phillips embayment with the “graptolitic facies” representing the basinal deposits and the “carbonate facies” showing the transition into shallow-water platform deposits. Dashed line represents the position of the shelf–slope break. Study localities: TWC, Twilight Creek; ABR Abbott River.]()
![—Microphotographs taken under reflected, plane-polarized light (except for c), oil immersion. The long axis of each photo is 240 µm. (a) Completely rounded, low-reflecting bitumen (B) in shale matrix; sample Cape Phillips, 183 m. (b) Rounded bitumen (B1) and soft, mottled bitumen (B2) squeezed between two graptolite fragments (G); sample Cape Phillips, 171 m. (c) Rounded bitumen (B) with a slightly granular texture in shale matrix; sample Cape Sir John Franklin, 308 m. (d) Subrounded fragment of granular bitumen; sample Cape Sir John Franklin, 308 m. (e) Highly angular bitumen (B), resembling “reservoir” bitumen in carbonate matrix; sample Twilight Creek, 68 m. (f) Transition between soft bitumen (B) and graptolite fragments (G); sample Cape Phillips, 314 m.]()
![Fig. 7.]()
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![Major element chemistry of 1.7- and 1.4-Ga plutons of Colorado and Wyoming. Sources of data: Twilight gneiss (Barker et al., 1976a); Boulder Creek (Gable, 1980; Anderson unpublished); Crampton, Twin Mountain, Pitts Meadow, Phantom, Kroenke, and Garell Peak (Hallett, 1990; Cullers, unpublished); Sherman (Eggler, 1968; Edwards, 1993); Virginia Dale (Vasek, 1995), Log Cabin, St., Vrain, and Silver Plume (Anderson and Thomas, 1985); Oak Creek and West McCoy (Cullers et al., 1993); Curecanti (Hansen, 1964); Eolus (Collier, 1989); and San Isabel (Cullers et al., 1992).]()
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Stratigraphic columns of the Twilight Creek and Snowblind Creek sections, a... Available to Purchase
in A new Gorstian radiolarian fauna from the upper Silurian of the Cape Phillips Formation, Cornwallis and Bathurst islands, Canadian Arctic
> Canadian Journal of Earth Sciences
Published: 23 September 2015
Fig. 2. Stratigraphic columns of the Twilight Creek and Snowblind Creek sections, and their relative positions on the margin.
Image
Actual position of the two studied localities (Twilight Creek, TWC; Snowbli... Available to Purchase
in A new Gorstian radiolarian fauna from the upper Silurian of the Cape Phillips Formation, Cornwallis and Bathurst islands, Canadian Arctic
> Canadian Journal of Earth Sciences
Published: 23 September 2015
Fig. 1. Actual position of the two studied localities (Twilight Creek, TWC; Snowblind Creek, SB) within the Arctic Islands. Dashed line represents the shelf break separating the basinal graptolitic facies from the platform one.
Image
Measured stratigraphic sections from Twilight Creek and Abbott River showin... Available to Purchase
in Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events
> Canadian Journal of Earth Sciences
Published: 24 October 2005
Fig. 2. Measured stratigraphic sections from Twilight Creek and Abbott River showing lithology, age, fossil control, and position of events discussed in text. Solid dots represent horizons with biostratigraphically useful graptolites, open dots represent horizons with radiolarian recovery
Image
Lithologic column and selected geochemistry of the Twilight Creek Section, ... Available to Purchase
in Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events
> Canadian Journal of Earth Sciences
Published: 24 October 2005
Fig. 4. Lithologic column and selected geochemistry of the Twilight Creek Section, Bathurst Island. Dashed lines show the positions of the Ireviken, C. lundgreni , and Co. ludensis Extinction Event boundaries referred to in text. Graptolite Zonal abbreviations: greiston., M. griestonensis
Image
Figure 4 —Twilight Creek (east and west valley-side sections), Humphries H... Available to Purchase
in UPPER HOMERIAN (UPPER WENLOCK, SILURIAN) GRAPTOLITES FROM ARCTIC CANADA
> Journal of Paleontology
Published: 01 March 2002
Figure 4 —Twilight Creek (east and west valley-side sections), Humphries Hill and Hoved Island sections; all graptolites are preserved as flattened films on shale or siltstone
Journal Article
A new Gorstian radiolarian fauna from the upper Silurian of the Cape Phillips Formation, Cornwallis and Bathurst islands, Canadian Arctic Available to Purchase
Journal: Canadian Journal of Earth Sciences
Publisher: Canadian Science Publishing
Published: 23 September 2015
Canadian Journal of Earth Sciences (2015) 52 (10): 863–879.
...Fig. 2. Stratigraphic columns of the Twilight Creek and Snowblind Creek sections, and their relative positions on the margin. ...
FIGURES
Journal Article
Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events Available to Purchase
Journal: Canadian Journal of Earth Sciences
Publisher: Canadian Science Publishing
Published: 24 October 2005
Canadian Journal of Earth Sciences (2005) 42 (8): 1419–1430.
...Fig. 2. Measured stratigraphic sections from Twilight Creek and Abbott River showing lithology, age, fossil control, and position of events discussed in text. Solid dots represent horizons with biostratigraphically useful graptolites, open dots represent horizons with radiolarian recovery...
FIGURES
Image
Figure 1 —Section location map. 1, Snowblind Creek; 2, Abbott River; ... Available to Purchase
in UPPER HOMERIAN (UPPER WENLOCK, SILURIAN) GRAPTOLITES FROM ARCTIC CANADA
> Journal of Paleontology
Published: 01 March 2002
Figure 1 —Section location map. 1, Snowblind Creek; 2, Abbott River; 3a, b, Twilight Creek, east and west valley sections, respectively; 4, Humphries Hill; 5, Hoved Island; 6, Cape Sir John Franklin. The dashed line marks the approximate boundary between the shelf platform (east
Image
Index map of a portion of the Arctic Islands, showing locations of graptoli... Available to Purchase
in Early Devonian graptolites and graptolite biostratigraphy, Arctic Islands, Canada
> Canadian Journal of Earth Sciences
Published: 20 August 2013
Fig. 1. Index map of a portion of the Arctic Islands, showing locations of graptolite sections. 1, Polar Bear Pass; 2, Moses Robinson River; 3, Stuart River; 4, Cut Through Creek; 5, Twilight Creek; 6, Grant Point; 7, Humphries Hill; 8, Cape Sir John Franklin; 9, Cape Lyons; 10, Eidsbotn River
Image
Inset map at top left showing location of study area within the Arctic Isla... Available to Purchase
in Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events
> Canadian Journal of Earth Sciences
Published: 24 October 2005
. Dashed line represents the position of the shelf–slope break. Study localities: TWC, Twilight Creek; ABR Abbott River.
Image
—Microphotographs taken under reflected, plane-polarized light (except for ... Available to Purchase
Published: 01 July 1996
), resembling “reservoir” bitumen in carbonate matrix; sample Twilight Creek, 68 m. (f) Transition between soft bitumen (B) and graptolite fragments (G); sample Cape Phillips, 314 m.
Image
( a ) Spumellarian fam., gen., et sp. indet., 99 SB3 16m. ( b ) Maletzella... Available to Purchase
in A new Gorstian radiolarian fauna from the upper Silurian of the Cape Phillips Formation, Cornwallis and Bathurst islands, Canadian Arctic
> Canadian Journal of Earth Sciences
Published: 23 September 2015
) Scolecodonts from Snowblind Creek (SB) section. ( r ) Chitinozoan from SB section. ( s – u ) Sponge spicules from SB section. ( v ) Sponge spicule from Twilight Creek (TWC) section. Scale bar = 100 μm for all figures.
Journal Article
Early Devonian graptolites and graptolite biostratigraphy, Arctic Islands, Canada Available to Purchase
Journal: Canadian Journal of Earth Sciences
Publisher: Canadian Science Publishing
Published: 20 August 2013
Canadian Journal of Earth Sciences (2013) 50 (11): 1097–1115.
...Fig. 1. Index map of a portion of the Arctic Islands, showing locations of graptolite sections. 1, Polar Bear Pass; 2, Moses Robinson River; 3, Stuart River; 4, Cut Through Creek; 5, Twilight Creek; 6, Grant Point; 7, Humphries Hill; 8, Cape Sir John Franklin; 9, Cape Lyons; 10, Eidsbotn River...
FIGURES
Journal Article
Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic-carbonate nearshore marine facies in the San Juan Mountains (southwestern Colorado, USA): Multiple incised valleys backfilled by lowstand and transgressive systems tracts Open Access
Journal: Geosphere
Publisher: Geological Society of America
Published: 09 August 2019
Geosphere (2019) 15 (5): 1479–1507.
..., and plagioclase from the Proterozoic Twilight Gneiss. Rare sandstone and mudrock lithics may have sourced from the East Lime Creek Conglomerate. The source of the chert lithics is not presently known, but one possible source would be the Ptarmigan Chert Member of the Lower Ordovician Manitou Formation...
FIGURES
Includes: Supplemental Content
Image
Major element chemistry of 1.7- and 1.4-Ga plutons of Colorado and Wyoming.... Available to Purchase
Published: 01 January 1999
Figure 2. Major element chemistry of 1.7- and 1.4-Ga plutons of Colorado and Wyoming. Sources of data: Twilight gneiss ( Barker et al., 1976a ); Boulder Creek ( Gable, 1980 ; Anderson unpublished); Crampton, Twin Mountain, Pitts Meadow, Phantom, Kroenke, and Garell Peak ( Hallett, 1990 ; Cullers
Journal Article
Ignacio Quartzite of Southwestern Colorado Available to Purchase
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
Published: 01 November 1957
AAPG Bulletin (1957) 41 (11): 2508–2518.
... west of south from Silverton, near which the formation is well exposed… The only identifiable fossil invertebrate yet obtained from the Ignacio beds was found on a remnant capping Overlook Point, one of the hills of Mountain View Crest, in the Needle Mountains quadrangle, south of Needle Creek...
FIGURES
Journal Article
Geology, Petrology, and Controls on PGE Mineralization of the Southern Roby and Twilight Zones, Lac des Iles Mine, Canada Available to Purchase
Journal: Economic Geology
Publisher: Society of Economic Geologists
Published: 01 January 2005
Economic Geology (2005) 100 (1): 43–61.
... (typically less than 3 vol %) and exceptionally high Pd contents (Pd/Pt ~10, Pd/Au ~13). Detailed mapping of the southern Roby and Twilight zones shows that early leucocratic rocks are barren and that the bulk of Pd was introduced by late melanocratic magmas. The average concentration of Pd...
FIGURES
Journal Article
Pennsylvanian sinistral faults along the southwest boundary of the Uncompahgre uplift, Ancestral Rocky Mountains, Colorado Open Access
Journal: Geosphere
Publisher: Geological Society of America
Published: 01 June 2007
Geosphere (2007) 3 (3): 119–132.
...). Along an east-west–striking segment of the boundary between the Paradox basin and Uncompahgre uplift, a system of steep faults defines a horst and graben system, which includes the Grenadier fault block. Positive flower structures (anticlines) along both the bounding (Coal Bank Pass and Molas Creek...
FIGURES
Includes: Supplemental Content
Journal Article
UPPER HOMERIAN (UPPER WENLOCK, SILURIAN) GRAPTOLITES FROM ARCTIC CANADA Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 March 2002
Journal of Paleontology (2002) 76 (2): 321–346.
...Figure 4 —Twilight Creek (east and west valley-side sections), Humphries Hill and Hoved Island sections; all graptolites are preserved as flattened films on shale or siltstone ...
FIGURES
Journal Article
Paleo- and Mesoproterozoic granite plutonism of Colorado and Wyoming Available to Purchase
Journal: Rocky Mountain Geology
Publisher: University of Wyoming
Published: 01 January 1999
Rocky Mountain Geology (1999) 34 (2): 149–164.
...Figure 2. Major element chemistry of 1.7- and 1.4-Ga plutons of Colorado and Wyoming. Sources of data: Twilight gneiss ( Barker et al., 1976a ); Boulder Creek ( Gable, 1980 ; Anderson unpublished); Crampton, Twin Mountain, Pitts Meadow, Phantom, Kroenke, and Garell Peak ( Hallett, 1990 ; Cullers...
FIGURES
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