Environmental Engineering Reference
In-Depth Information
TABLE 1
Summary of First Occurrences for Each lchnospecies or Unnamed Type from Connecticut River Valley, USA Varves
Undichna
Cochlichnus
isp.
Broomichnium
flirii
Arthropod
trace fossils
Piscichnus
isp.
Site
Varves
unisulca
bina
britannica
simplicitas
North PAS-2
7320-7763
7320
7350
7352
7362
7352
7530
WR-1
7134-7607
7134
7478
7350
7360
7500
>
>
NEW
6980-7765
6980
7022
7281
7027
7359
7500
7610
>
MER-2
6150-6210
6124
6209
MER-1
6100-6200
6100
6168
6124
WAL
5938-5960
5938
5967
5939
5938
CB
5930-6100
5930
?
South RR
5130-5220
5130
5141
5219
KF-C
3820-4150
3820
CHIC
3586-3660
3586
d
d
d
d
d
d
d
First occurrence of each reported as the New England Varve Chronology (NEVC;
Ridge, 2003, 2004
) varve year in which it was found or a reference to the oldest varve year from which
it could have been taken (
>
,
). Cells have been shaded with color according to the ecological stage; the assemblage represents blue, stage 1; green, stage 2; yellow, stage 3; red, stage 4.
See text for explanation.
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