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publications > open file report > OFR 2007-1203 > table 2

Table 2: Summary of data used to determine beginning of 20th century deposition in cores: first occurrence datum for Casuarina equisetifolia and depth to background levels of lead-210. Data are illustrated in Figure 2 and 3. Total lead-210 is shown in Figures 4-9.

 
First occurrence datum for Casuarina
Lead-210 Data
Core location name
Core ID
Number on Fig. 1 and Table 1
First occurrence datum used (cm)
Range of possible first occurrence (cm)1
Depth to background (cm)
Comments
Biscayne Bay Cores:
 
Black Point SEI0297 BP1
3
---
---
---
 Analyzed to 20 cm - no change with depth
Black Point North GLW0603 BPNA
13
21
20-24
30-40
  
Card Bank SE side SEI0297 CB1
4
---
---
---
 Analyzed to 28 cm - no change with depth
Card Bank NW side GLW0402 CBA
7
21
20-30
44-46
  
Card Bank NW side GLW0402 CBB
8
---
---
---
  
Chicken Key GLW0603 CKA
15
35
34-40
36-40
 Change in sedimentation rate indicated at 32 cm. Sedimentation disrupted.
Featherbed Bank SEI0297 FB1
5
---
---
58-60
  
Featherbed Bank GLW0402 FBA
9
71
70-80
70-80
  
Featherbed Bank GLW0402 FBB
10
---
---
---
  
Manatee Bay SEI1196 MB1
1
65
64-66
---
 Analyzed to 36 cm - no change with depth
Middle Key Basin GLW0603 MKA
17
21
20-24
26-28
 Note increase at base
No Name Bank GLW0402 NNA
11
61
60-70
60
  
No Name Bank GLW0402 NNB
12
---
---
---
  
Rickenbacher SEI0299 Rick1
6
---
---
23
 Possible unconformity
Florida Bay Cores:
  
Bob Allen mudbank FB294 6A (SFWMD 6A)
22
51
50-60
82
  
Bob Allen mudbank FB294 6C (SFWMD 6C)
23
---
---
120
  
Bob Allen mudbank FB295 20D
40
---
---
120
  
Bob Allen mudbank FB697 24A
51
---
---
81
  
Bob Allen mudbank FB697 24C
52
---
---
73
  
Bob Allen mudbank FB697 24D
53
---
---
---
 Does not reach background
Crocodile Point FB295 16B
33
---
---
49
 Note increase at base
Johnson Key FB294 11A (SFWMD 11A)
27
---
---
20
 Spike at bottom due to upwelling of ground water
Lake Ingraham FB294 8B (SFWMD 8B)
25
---
---
---
 Does not reach background
Little Madeira - Taylor Creek FB594 24
28
41
40-50
40
  
Little Madeira Bay FB295 14B
31
---
---
---
 Does not reach background
Little Madeira Bay (off East Creek) Little Mad 99-08-17-1
55
---
---
60
  
Little Madeira Bay (west side) Little Mad 00-02-15-5
57
---
---
---
 Does not reach background
Park Key FB697 23A
50
---
---
45
  
Pass Key FB295 17D
34
---
---
---
 Does not reach background
Pass Key FB295 17G
35
---
---
91
  
Pass Key FB596 35 (96-05-26-35)
41
---
---
68
  
Pass Key FB596 37 (96-05-26-37)
42
---
---
66
  
Pass Key FB697 21A
43
---
---
100
  
Pass Key FB697 21B
44
---
---
---
 Does not reach background
Pass Key - North FB697 21E
45
---
---
---
 Does not reach background
Pass Key - South FB697 21F
46
---
---
60
 Base of core - may go lower
Porjoe Key FB295 12B
29
---
---
49
  
Porjoe Key FB295 12D
30
---
---
61
  
Rabbit Key FB294 3B (SFWMD 3B)
19
---
---
13
  
Rankin Bight FB294 7B (SFWMD 7B)
24
---
---
20
  
Rankin Lake GLBW601 RL1
58
39
38-42
36-38
  
Russell Bank - South FB294 10B (SFWMD 10B)
26
---
---
110
  
Russell Bank - North FB295 18C
36
---
---
113
  
Russell Bank FB295 19A
37
93
92-104
120
  
Russell Bank FB295 19B
38
---
---
107
  
Russell Bank FB295 19C
39
---
---
118
  
Russell Bank FB697 22A
47
---
---
97
  
Russell Bank - South FB697 22B
48
---
---
---
 Does not reach background
Russell Bank - South FB697 22D
49
---
---
85
  
Russell Bank - South (Grass Bed) Russell 00-2-15-1
56
---
---
107
  
Trout Creek FB295 13A
32
---
---
27
  
Whipray Basin FB294 5A (SFWMD 5A)
20
---
---
---
 Does not reach background
Whipray Basin FB294 5G (SFWMD 5G)
21
---
---
29
  
Whipray Basin FB697 25B
54
---
---
44
 Increases near base

1Range of possible first occurrence takes into account sampling interval and the next lowest sample in which no Casuarina is found. This equates to the internal variance used in the age model.

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Last updated: 11 January, 2008 @ 11:38 AM(TJE)