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In July 2009, Dr. Paul Sanborn undertook the first soils field research at the Fort Selkirk volcanic field in central Yukon, with helicopter support and funding from the Yukon Geological Survey. This file consists of prints of aerial photographs that depict the area accessed for the study, upstream from the confluence of the Yukon River and the Pelly River.

Air photographs include:
Flight line A17210, Photo Nos. 54-60 (taken 1960)
Flight line A22354, Photo Nos. 43-45, 47-48 (taken 1971)
Flight line A27516, Photo Nos. 48-52 (taken 1989)

File contains 2 rolls (51 slides) taken September 25-26, 1995 that depict paired views of plot vegetation and forest floor surface. Handwritten number notations on slide frames indicate plot numbers from the original research installation.

File consists of photographic slides from the Arocena & Sanborn 1999 regional soil mineralogy study.

File contains 8 slides from 2 rolls, taken August 1997:
Roll 1 - Buckhorn Ridge:

• Slide 31 – Fd (2 x 2 m) – stand view
• Slide 32 – Fd (2 x 2 m) – forest floor view
• Slide 33 – Pl (2x 2 m) – stand view
• Slide 34 – Pl (2 x 2 m) – forest floor view
  Roll 2 – Bobtail Road:
• Slide 20 – Pl (2 x 2 m) – east plot, stand view
• Slide 21 – Pl (2 x 2 m) – east plot, stand view
• Slide 22 – Fd (2 x 2 m) – east plot, stand view
• Slide 23 – Sw (2 x 2 m) – stand view

EP 660 was a conventional silvicultural trial established in 1967 which involved single species plantings of lodgepole pine (Pl), white spruce (Sw), and Douglas-fir (Fd) at different spacings. Three installations were established in the Prince George - Vanderhoof area: Buckhorn Ridge, Bobtail Road, and Chilco Creek.

General details on EP 660 are given by:
Coopersmith, D., M. McLellan, and J. Stork. 1997a. Experimental Project 660 overview of three experimental installations – a 30-year progress report. B.C. Min. For., Prince George For. Reg., Res. Note #PG-12.

Details on the Buckhorn installation are given by:
Coopersmith, D., M. McLellan, and J. Stork. 1997b. Experimental Project 660 30-year progress report: Buckhorn Installation. B.C. Min. For., Prince George For. Reg., Res. Note #PG-12-1.

The Archie Creek site is the informal name used for a research installation established in 1971 east of Prince George by the Canadian Forest Service, and subsequently abandoned by the end of that decade. Dr. Paul Sanborn revisited the site in 1995, and sampled forest floors and mineral soils across a range of conifer-broadleaf mixtures established by natural establishment of broadleaf trees among planted lodgepole pines.

Details of the site conditions, sampling methods, and results were published in:
Sanborn, P. 2001. Influence of broadleaf trees on soil chemical properties: A retrospective study in the Sub-Boreal Spruce Zone, British Columbia, Canada. Plant and Soil 236: 75–82. https://doi.org/10.1023/A:1011973402414

This file contains the following photographs in both print photograph and negative format:

Slims River delta
Date: August 11, 2003
(location not recorded)
Print roll 5, #1-3 (Corresponding slides: Slides roll 3, #15-14)

Grizzly bear
Date: August 12, 2003
(beside Cultus Bay Rd.; location not recorded)
Print roll 5, #6-7

Y03-08 (Cultus Bay Rd. – at top of switchbacks)
Date: August 12, 2003
Location Coordinates: 61° 3’ 43.1” N, 138° 21’ 4.0” W, 833.8 m asl (± 5.1 m)
Site Description: good exposure of loess (35 cm) with Slims Soil over glaciofluvial terrace – pinches out downslope [note: this site was sampled because of development of buried paleosol, and was not part of biological crust study by Marsh et al. (2006)]
Sample Depths & Descriptions:

• Y03-08-01 - 45-48 cm - Ahkb (7.5YR 3/3 d; strongly effervescent)
• Y03-08-02 - 48-56 cm - Bmkb (7.5YR 4/3 d; strongly effervescent)
• Y03-08-03 - 56-70 cm - Ccab (2.5Y 5/2 d; strongly effervescent)
• (not sampled) - 70 cm+ - IICca (glaciofluvial; strongly effervescent)
• Intact sample: 56-36 cm - depth (including Slims Soil)
  Print roll 5, #8-10, 17-18 (Corresponding slides: Slides roll 3, #13-11, 5-4)

Y03-09 (cliff top on E. shore of Kluane L. at Christmas Bay)
Date: August 12, 2003
Location Coordinates: 61° 4’ 0.0” N, 138° 22’ 35.3” W, 828.3 m asl (± 7.3 m)
Site Description: ~ 60 cm loess over glaciofluvial gravels
Sample Depths & Descriptions:

• Y03-09-01 - Nostoc crust
• Y03-09-02 - Tortula ruralis – Cetraria crust
• Y03-09-03 - 0-14 cm - ACk (10YR 3\2 d)
• Y03-09-04 - 14-16 cm - Ahkb1 (10YR 2/2 d)
• Y03-09-05 - 16-18 cm - Ck1 (10YR 4/3 d)
• Y03-09-06 - 18-20 cm - Ahkb2 (10YR 3/2 d; discontinuous)
• Y03-09-07 - 20-27 cm - Bmkb1 (10YR 4/3 d)
• Y03-09-08 - 27-33 cm - Bmkb2 (7.5YR 4/3 d)
• Y03-09-09 - 33-46 cm - Bmkb3 (10YR 4/3 d)
• Y03-09-10 - 46-55 cm - Ck2 (2.5Y 5/3 d)
• (not sampled) - 55-60 cm+ - IICk (glaciofluvial gravels)
  Print roll 5, #11-15 (Corresponding slides: Slide roll 3, #10-6)

Y03-10 (shore bluff N. of Silver City)
Date: August 12, 2003
Location Coordinates: 61° 2’ 55.0” N, 138° 23’ 17.2” W, 806.7 m asl (± 7.3 m)
Site Description: 70% slope, SW aspect; vegetation: Elymus, Carex, Artemisia, Erigeron
Sample Depths & Descriptions:

• Y03-10-01 - Crust
• Y03-10-02 - 0-18 cm - ACk (10YR 4/2 m; strongly effervescent)
• Y03-10-03 - 18-25 cm - Ahkb(?) (10YR 4/2 m; strongly effervescent)
• Y03-10-04 - 25-40 cm - Ck (2.5Y 5/2.5 m; strongly effervescent)
• (not sampled) - 40 cm+ - IICk (glaciofluvial gravels; strongly effervescent)
  Print roll 5, #19-22 (Corresponding slides: Slide roll 3, #3-1)

Silver City ghost town (location not recorded)
Date: August 12, 2003
Print roll 5, #23-24

Y03-11 (Silver City road section)
Date: August 12, 2003
Location Coordinates: 61° 2’ 3.6” N, 138° 22’ 48.8” W, 806.7 m asl (± 8.7 m)
Site Description: roadcut through SW-facing hill exposes loess over glaciofluvial gravel, with 4 paleosols in colluviated loess
Sample Depths & Descriptions:

• Y03-11-01 - 0-18 cm - ACk (fresh loess)
• Y03-11-02 - 18-47 cm - Soil 1 – Bmk
• Y03-11-03 - 47-100 cm - Loess
• Y03-11-04 - 100-110 cm - Soil 2 – includes charcoal
• Y03-11-05 - 110-160 cm - Loess with secondary carbonate in root channel
• Y03-11-06 - 160-170 cm - Soil 3 – Ahk with charcoal
• Y03-11-07 - 160-170 cm - Soil 3 – Bmk
• Y03-11-08 - 170-198 cm - Loess with secondary carbonate in root channel
• Y03-11-09 - 198-202 cm - Soil 4 – Ahk – laterally continuous for ~ 1.5 m
• Y03-11-10 - 202-230 cm - Loess with secondary carbonates in roots
• Y03-11-11 - 230-255 cm - Soil 5 – Ahk – includes abundant charcoal bands
• Y03-11-12 - 230-255 cm - Soil 5 – Bmk – infilled squirrel burrows immediately below
• Y03-11-13 - 255-300 cm+ - Loess
  Additional notes on modern soil & paleosols:
  Soil 1
• consists of Bmk horizon material with 2 distinct colours: 7.5YR 4/3 d & 10YR 4/3 d
• loess between Soils 1 & 3 is sandier
  Soil 2
• 90% Ahk material, 2-10 cm thick
• Ahk – 10YR 3/2 d
• Bmk – 7.5YR 4/2 d
• less abundant carbonate than in paleosols & loess below
  Soil 3 - most of exposure has Ahk (2-5 cm thick) over Bmk (4-10 cm thick), with carbonates as for Soil 5
  Soil 4 - mostly Ahk (10YR 3/2 d) material 2-8 cm thick, some Bmk (10YR 4/2 d) < 2 cm thick, with carbonates as for Soil 5
  Soil 5
• complex intermixing of Ahk & Bmk material, charcoal most abundant in Ahk
• individual colour bands 2-10 cm thick
• overall dip of horizons (10° to W) is parallel to surface
• similar size & density of secondary carbonates as in loess above & below; associated with root channels, < 5 mm diameter, covering ~ 5% of surface
  Print roll 5, #26-30 (Corresponding slides: Slide roll 4, #36-32)

Slide roll contains the following photographs:

Y03-06
Date: August 10, 2003
Location Coordinates: 61° 4’ 1.5” N, 138° 21’ 57.4” W, 825.3 m asl (± 9.5 m)
Site Description: top of slope, E aspect
Sample Depths & Descriptions:

• Y03-06-01 - Crust
• Y03-06-02 - 0-6 cm - Ahk (10YR 3/2 m; strongly effervescent)
• Y03-06-03 - 6-14 cm - Bmk (2.5Y 3/3 m; strongly effervescent)
• Y03-06-04 - 14 cm+ - IICk (strongly effervescent)
  Slide roll 3 #36-35 (corresponding prints and negatives: Print roll 4, #1-2)

Y03-07 (peninsula near Kluane visitor centre, Sheep Mt.)
Date: August 11, 2003
Location Coordinates: 61° 1’ 42.8” N, 138° 29’ 36.2” W, 786.7 m asl (± 5.7 m)
Site Description:

• recent (?) landslide with loess accumulation in pockets, thinner on boulder surfaces, dominated by dark cyanobacteria crusts
• limited loess accumulation due to exposure of site
• crust is calcareous at surface
  Sample Depths & Descriptions:
• Y03-07-01 - Crust
• Y03-07-02 - 0-6 cm - Ck
• Y03-07-03 - 6-9 cm - Ahkb
• Y03-07-03 - 9 cm+ - Rock
  Slide roll 3 #34-30 (corresponding prints and negatives: Print roll 4, #3-10)

Lower Slims River (lookout knoll at parking lot N of visitor centre)
Date: August 11, 2003
Location Coordinates: 60° 59’ 56.4” N, 138° 33’ 36.4” W, 844.8 m asl (± 7.3 m)
Site Description: some fire disturbance, but lower slopes have more intact crusts on loess (calcareous to surface)
Slide roll 3 #29-26 (corresponding prints and negatives: Print roll 4, #11-17)

Lower Slims R (lowest bench below lookout knoll)
Date: August 11, 2003
Location Coordinates: 60° 59’ 51.8” N, 138° 33’ 36.2” W, 814.3 m asl (± 7.9 m)
Site Description: not burned; good intact crust; vegetation: A. frigida, Calamogrostis purpurea, Erigeron caespitosus, Linnaea, Carex filifolia (sparse cover ~ 50%)
Slide roll 3, #25-23 (corresponding prints and negatives: Print roll 4, #18-20)

Slims Soil
(Holocene paleosol with well-developed B horizon under Neoglacial calcareous loess – location not recorded, but likely from roadcut exposure along main Slims R trail)
Slides roll 3, #22 (corresponding prints and negatives: Print roll 4, #21)

Lower end of Sheep Creek
Date: August 11, 2003
Misc. views of grassland vegetation and landscape (locations not recorded)
Slides roll 3, #21-18 (corresponding prints and negatives: Print roll 4, #26-33)

Overlook at lower end of Sheep Creek canyon
Date: August 11, 2003
Location Coordinates: 60° 59’ 42.2” N, 138° 34’ 38.1” W, 878.0 m asl (± 9.5 m)
Site Description: heavy use by sheep (abundant droppings) but still has ~ 50% crust coverage
Slides roll 3, #17-16 (corresponding prints and negatives: Print roll 4, #34-35)

Slims River delta
Date: August 11, 2003
(location not recorded)
Slides roll 3, #15-14: salt efflorescences (corresponding prints and negatives: Print roll 5, #1-3)

Y03-08 (Cultus Bay Rd. – at top of switchbacks)
Date: August 12, 2003
Location Coordinates: 61° 3’ 43.1” N, 138° 21’ 4.0” W, 833.8 m asl (± 5.1 m)
Site Description: good exposure of loess (35 cm) with Slims Soil over glaciofluvial terrace – pinches out downslope [note: this site was sampled because of development of buried paleosol, and was not part of biological crust study by Marsh et al. (2006)]
Sample Depths & Descriptions:

• Y03-08-01 - 45-48 cm - Ahkb (7.5YR 3/3 d; strongly effervescent)
• Y03-08-02 - 48-56 cm - Bmkb (7.5YR 4/3 d; strongly effervescent)
• Y03-08-03 - 56-70 cm - Ccab (2.5Y 5/2 d; strongly effervescent)
• (not sampled) - 70 cm+ - IICca (glaciofluvial; strongly effervescent)
• Intact sample: 56-36 cm - depth (including Slims Soil)
  Slides roll 3, #13-11, 5-4 (corresponding prints and negatives: Print roll 5, #8-10, 17-18)

Y03-09 (cliff top on E. shore of Kluane L. at Christmas Bay)
Date: August 12, 2003
Location Coordinates: 61° 4’ 0.0” N, 138° 22’ 35.3” W, 828.3 m asl (± 7.3 m)
Site Description: ~ 60 cm loess over glaciofluvial gravels
Sample Depths & Descriptions:

• Y03-09-01 - Nostoc crust
• Y03-09-02 - Tortula ruralis – Cetraria crust
• Y03-09-03 - 0-14 cm - ACk (10YR 3\2 d)
• Y03-09-04 - 14-16 cm - Ahkb1 (10YR 2/2 d)
• Y03-09-05 - 16-18 cm - Ck1 (10YR 4/3 d)
• Y03-09-06 - 18-20 cm - Ahkb2 (10YR 3/2 d; discontinuous)
• Y03-09-07 - 20-27 cm - Bmkb1 (10YR 4/3 d)
• Y03-09-08 - 27-33 cm - Bmkb2 (7.5YR 4/3 d)
• Y03-09-09 - 33-46 cm - Bmkb3 (10YR 4/3 d)
• Y03-09-10 - 46-55 cm - Ck2 (2.5Y 5/3 d)
• (not sampled) - 55-60 cm+ - IICk (glaciofluvial gravels)
  Slide roll 3, #10-6 (corresponding prints and negatives: Print roll 5, #11-15)

Y03-10 (shore bluff N. of Silver City)
Date: August 12, 2003
Location Coordinates: 61° 2’ 55.0” N, 138° 23’ 17.2” W, 806.7 m asl (± 7.3 m)
Site Description: 70% slope, SW aspect; vegetation: Elymus, Carex, Artemisia, Erigeron
Sample Depths & Descriptions:

• Y03-10-01 - Crust
• Y03-10-02 - 0-18 cm - ACk (10YR 4/2 m; strongly effervescent)
• Y03-10-03 - 18-25 cm - Ahkb(?) (10YR 4/2 m; strongly effervescent)
• Y03-10-04 - 25-40 cm - Ck (2.5Y 5/2.5 m; strongly effervescent)
• (not sampled) - 40 cm+ - IICk (glaciofluvial gravels; strongly effervescent)
  Slide roll 3, #3-1 (corresponding prints and negatives: Print roll 5, #19-22)