
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.
|

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. |
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.
|