Surficial Geology Figure 1

 

Figure 1. Showing a Huntec boomer section and interpretation displaying seismic units 1 and 3. Unit 1 is characterized by a discontinuous high-amplitude upper surface reflector and incoherent, but strong internal reflectors. It displays a highly irregular, undulating topography that can be seen to dip steeply into the subsurface. Water depth at the deepest point is 64 m. Depth of section assumes velocity of 1500 m/s.

 

Figure 2. Huntec DTS profile showing representatives of the three seismic units above bedrock: diamict or till, glacial
marine sediments and Holocene reworked material.

Surficial Geology Figure 3

Figure 3. Huntec seismic profile showing complex depositional sequence of post-glacial reworked sediment (Unit 4)
overlying bedded glacial marine unit (Unit 3). Note the erosional upper surface unconformity of Unit 3 and the
complex sediment drift sequences of Unit 4 with onlap onto this unconformity.



Figure 4. Huntec boomer section, showing the typical stratigraphy of the glacial marine and
Holocene sections. Water depth at deepest point is 80 m. Depth in sections assumes 1500 m/s.
Surficial Geology Figure 5

 

 

 

 

 

 

 

 

 

 

Figure 5. Bedforms are nearly ubiquitous throughout the study region. This example is a swath
bathymetric image from an area just east of Victoria, British Columbia near the entrance to Haro
Strait, in which the bedforms are a series of sand dunes, up to 25 metres in height and with 500
meter wavelengths. This example is extreme but attests to the strong tidal and estuarine
circulation currents active in the study region

 

Figure 6. A Seistec boomer section off Esquimalt Harbour shows the glacial marine section (unit 3) separated from the Holocene section (unit 4) by an erosional unconformity. This unconformity truncates reflectors of unit 3 and, in this location, shows several "terraces" which are interpreted as representing former sea level stands during the last sea level recession at the end of the Fraser stade glaciation.

 

Figure 7. Seistec Boomer profile off Esquimalt Harbour showing a series of terraces or "barriers" that may represent stands during the Holocene sea level transgression.

Carbon 14 Dates
CENTER FOR ACCELERATOR MASS SPECTROMETRY - Lawrence Livermore National Laboratory

CAMS# Sample Name Depth (cm) delta 13C Fraction Modern +/- D14C +/- 14C age +/-
58672 T9603-1-20 20 -0.3 0.8069 0.0040 -193.1 4.0 1720 40
58673 T9603-3-98 360 0 0.2272 0.0012 -772.8 1.2 11900 50
58674 T9604-2-6 63 0 0.8626 0.0042 -137.4 4.2 1190 40
58675 T9604-3-110 319 0 0.3552 0.0018 -644.8 1.8 8310 50
58676 T9605-1-63 63 0 0.3435 0.0015 -656.5 1.5 8580 40
58677 T9605-2-70 210 0 0.2663 0.0014 -733.7 1.4 10630 50
58678 T9605-3-93 373 0 0.2614 0.0014 -738.6 1.4 10780 50
58679 T9606-1-85 85 0 0.2644 0.0014 -735.6 1.4 10690 50
58680 T9606-4-68 479 0 0.2567 0.0016 -743.3 1.6 10930 50
58681 T9607-2-29 64 0 0.1889 0.0012 -811.1 1.2 13390 60
58682 T9702-1-31 31 -25 0.9769 0.0049 -23.1 4.9 190 50
58683 T9702-1-45 45 0.2 0.8726 0.0043 -127.4 4.3 1090 40
58684 T9702-2-10 96 0 0.2659 0.0015 -734.1 1.5 10640 50
58685 T9702-2-138 224 0 0.2924 0.0015 -707.6 1.5 9880 50
58686 T9704-1-13 13 0 0.6339 0.0031 -366.1 3.1 3660 40
58687 T9705-2-64 114 0 0.2560 0.0015 -744.0 1.5 10950 50
58688 T9705-2-73 123 0 0.2664 0.0012 -733.6 1.2 10630 40
58689

T9705-3-17

205 0 0.1926 0.0012 -807.4 1.2 13230

50

58690 T9707-1-31 31 0 0.1922 0.0011 -807.8 1.1 13250 50
58691 T9708-1-33 33 0 0.5840 0.0031 -416.0 3.1 4320 50
58692 T9709-1-93 93 0.6 0.1921 0.0012 -807.9 1.2 13250 50
58693 T9709-1-133
fishbone carbonate
133 0 0.2066 0.0012 -793.4 1.2 12670 50
58694 T9711-2-37 182 0 0.1870 0.0012 -813.0 1.2 13470 60
58695 T9712-3-23 246 0 0.2632 0.0017 -736.8 1.7 10720 60
58696 T9712-3-102 325 0 0.1818 0.0011 -818.2 1.1 13690 50
58697 T9716-1-43 43 0 0.7319 0.0038 -268.1 3.8 2510 50
58698 T9716-2-120 179 0 0.2271 0.0013 -722.9 1.3 11910 50
58699 T9716-2-133 192 0 0.1974 0.0011 -802.6 1.1 13030 50
58700 T9716-3-130 342 0 0.1945 0.0012 -805.5 1.2 13150 50
58701 T9716-4-142 504 0 0.1863 0.0011 -813.7 1.1 13500 50
58702 T9718-2-23 61 0 0.3125 0.0016 -687.5 1.6 9340 50
58703 T9718-3-23 206 0 0.3054 0.0016 -694.6 1.6 9530 50
58704 T9718-3-137 320 0.4 0.2936 0.0015 -706.4 1.5 9840 50
58705 T9721-2-137 221 1.2 0.2680 0.0014 -732.0 1.4 10580 50
62531 99B-17-44cm 44 0 0.5354 0.0033 -464.6 3.3 5020 50
62532 99B-17-77cm 77 0 0.4477 0.0023 -552.3 2.3 6460 50
62533 99B-18-55cm 55 0 0.3475 0.0018 -652.5 1.8 8490 50
62534 99B-18-132cm 132 0 0.1892 0.0010 -810.8 1.0 13370 50
62534 99B-15-213cm 213 0 0.3299 0.0016 -670.1 1.6 8910 50
62768 99B-16-164cm 164 0 0.6389 0.0032 -361.1 3.2 3600 50

1) Delta 13C values are the assumed values according to Stuiver and Polach (Radiocarbon, v. 19, p.355, 1977) when given without decimal places. Values measured for the material itself are given with a single decimal place.
2) The quoted age is in radiocarbon years using the Libby half life of 5568 years and following the conventions of Stuiver and Polach (ibid.).
3) Radiocarbon concentration is given as fraction Modern, D14C, and conventional radiocarbon age.
4) Sample preparation backgrounds have been subtracted, based on measurements of samples of 14C-free coal and calcite. Backgrounds were scaled relative to sample size.