Bolinas 1998 Drive Cores - Diatom Counts and BIDI Calculation
 
Sample Number 98 D
BOL 2-29		 98 D
BOL 2-30		 98 D
BOL 2-31		 98 D
BOL 2-32		   98 D
BOL 3-11		 98 D
BOL 3-12		 98 D
BOL 3-13		 98 D
BOL 3-14		   98 D
BOL 4-8		 98 D
BOL 4-9		 98 D
BOL 4-10		 98 D
BOL 4-11		   98 D
BOL 6-11		 98 D
BOL 6-12		 98 D
BOL 6-13		   98 D
BOL 7-12		 98 D
BOL 7-13		 98 D
BOL 7-14		 98 D
BOL 7-15		 total counted
Depth (cm) 193 198 201.5 204   147 153 155 158   99 107 111 119   84 99 101.5   116 118.5 120.5 123.5
                                                 
Achnanthes delicatula 47 9   13 14     1 3   2 12 5 106
Achnanthes hauckiana 17         17
Achnanthes lanceolata 10 3 5   4   2   12 7 1   44
Actinoptychus senarius         1 1
Amphora libyca   5       5
Amphora ovalis 3 2     13     18
Amphora proteus 1   1       2
Amphora ventricosa 1 1   1 2       3 11 19
Anomoeoneis sphaerophora   1   3     4
Arachnodiscus ehernbergii     1     1
Aulacodiscus sp.       1   4 4 9
Bacillaria paradoxa 1   1   1 1     1 5
Caloneis bacillum 5 2 2       3   1 13
Caloneis lewisii 1         1
Caloneis westii 1         1 1 3
Campylodiscus echeneis 1   1     1   3
Cocconeis costata 2         2
Cocconeis diminuta 25 10   9 24   6 2   2 4   9 18 18 127
Cocconeis minutissima       1   1
Cocconeis placentula 3 7   54   48 85 85   3 1   286
Cocconeis placentula var. euglypta 1 11 3   2 17 61   4 13 71 150     333
Cocconeis peltoides       1 2   3 2 5 13
Cocconeis scutellum       2   12 15 29
Cocconeis scutellum var. parva 1 2 12 6   9   24   1 7   6 2 70
Coscinodiscus marginatus 1         1
Coscinodicscus obscurus         1 1
Cyclotella meneghiniana   3       3
Cyclotella striata   2 1   1 1   1   1 1 8
Cymbella cuspidata 1       3   4
Cymbella meulleri 5 1   5 3   2 2 4   1   23
Cymbella mexicana   1   3 1     5
Cymbella silesiaca 3       1   4
Dimmerogramma minor 6   17 7   10 1 1   9 4 13   5 3 13 89
Diploneis didyma       2   2
Diploneis interrupta   1       1 2
Diploneis pseudovalis 2   1     1   4
Diploneis smithii var. rhombica 1     1     2
Endictya hendeyi   1 1       2
Epithemia sorex   1 2 1   2 2 3     11
Epithemia turgida 1 7 6 37   6 50 30   2 12 48 54   20   273
Eunotia formica       2   2
Eunotia lunaris   8   1 3 1   1   14
Eunotia monodon 13 16   2   1   7 3   42
Eunotia polydentula       3 1   4
Frustulia vulgaris 1 2   1     61   1 66
Gomphonema accuminatum 1 1         2
Gomphonema affine 2   8 2       12
Gomphonema angustatum 1         1
Gomphonema angustatum var. sarcophagus 1 4   1 5   1   1 1   14
Gomphonema constricta var. capitata   2 6   1 1 1     11
Gomphonema gracile 2         2
Gomphonema parvulum 2   12 16   2 6 16   6 7   67
Gomphonema tenellum 3 13         16
Grammatophora marina     1     1
Gyrosigma accuminatum 5 6   1 1 2   2 4 2     1 24
Hyalodiscus laevis     1     1 2
Isthmia sp.         1 1
Licomphora gracilis 1         1
Luticola mutica 1 1 1 3   9   4   6 8   33
Mastogloia exigua 3 7 1     10     1 22
Melosira nummuloides 4   10   2 6     2 24
Meridion circulare var. constricta       1   1
Navicula capitata var. hungarica 1   1 1 1 5   1 4     14
Navicula cincta         1 1
Navicula cryptocephaloides     1     1
Navicula cryptotenella 4 6 1   1 2   118 5 1   4 9   1 2 154
Navicula digitoradiata 2     1   2 1   1 11 1 7 26
Navicula halophila   5   1     6
Navicula pygmacea 2         2
Navicula radiosa 21 56 4     17 25   2   125
Navicula salinarum 4 2 1   5   2 1     15
Navicula tenelloides 8       1   9
Navicula tripunctata 1 12 2   5 4   4 5   2 1   1 10 2 49
Neidium iridis var. ampliata     1     1
Nitzschia fasciculata 1         1
Nitzschia frustulia var. subsalina 6 11 3   4       6 3 33
Nitzschia granulata 7 1   6 4   3 1   2 2 12   27 5 5 75
Nitzschia Kutz.   6 5   5 5 8   4   33
Nitzschia recta 6         6
Nitzschia sigma 2 1   2 4     1   1 11
Nitzschia terrestris 1   1   3   1 2   8
Odontella aurita       1   2 3
Opephora parva 14 25 5 3   36 33 3   2 14   6   14 29 20 204
Paralia sulcata - small 222 109 28 28   189 121 6 35   107 39 27   412 230 239   5 414 247 212 2670
Paralia sulcata - large 2 1   2 1   1 2 3   1 5   1 2 1 22
Petroneis granulata 1       6   1 8
Pinnularia brevicostata 2 1   1 1     2 2   9
Pinnularia divergens   2       2
Pinnularia legumen 1         1
Pinnularia streptoraphe 1 1 1   1   1     5
Plagiotropis lepidotera     18     18
Rhaphoneis psammicola 1   1       2
Rhaphoneis surirella 4         4
Rhaphoneis surirella var. australis 1         1
Rhopalodia gibba 2 2 2   3 8   1 3 8   2   31
Rhopalodia gibberula   1   14 2   5 6   28
Rhopalodia musculus 8 44 11   8   2 2     1 1 6 3 86
Rhopalodia operculata   2       2
Scolioplerua tumida 1   2 3 2     3   8 6 16 41
Sellaphora pupula 3 3   12 6   3     27
Stauroneis kreigeri   1 3   2     6
Stauroneis phonicenteron 2   1       3
Staurosira construens 3         3
Staurosira construens var. venter 4 1         5
Surirella brebissonii   1       1
Surirella fatuosa       3   3
Surirella ovata     16   3   19
Surirella splendens     1     1
Synedra fasciculata 6 5 5   3 1   1 4 13 1   8   9 3 4 63
Synedra miniscula       12   12
Synedra rumpens   15 5   4 2 7     33
Synedra ulna 8 3 2   5 4   3 19   44 26 2   116
Terpinsoe americana     2     2
Thalassiosira decipiens     26     26
Thalassiosira pacifica 11 10 2   22 9   1   3   3 6 13 80
Trachneis aspera         2 2
Tryblionella accuminata 1 4 4   2 2 3   10 2 2   6   7 8 20 71
Tryblionella coarctata 1 2   8       1 6 18
Tryblionella debilis 5         5
Tryblionella levidensis 3 4   5 2 1     2   1 6 24
Tryblionella plana       1   1
Tryblionella punctata 16 3   11 16     19 2 59   18 31 38 213
Indeterminate 3 4 6 5   5 4 3 14   2 3 2 3   6 2 2   0 3 5 1 73
                                                 
Preservation G G G F   G F VG VG   F VG VG VG   F G G   P G G VG
Total Diatoms Counted 382 331 252 194   341 281 232 245   144 361 325 472   594 387 391   7 547 439 424 6349
Total High Marsh 0 9 0 0   0 0 0 1   0 3 0 0   1 2 1   0 0 0 0 17
Both Low and High 1 15 5 5   0 1 9 1   0 4 0 0   10 69 0   0 2 0 1 123
Total Low Marsh 2 15 57 14   1 3 5 10   2 130 5 2   4 9 3   1 11 15 21 310
Total Tidal Flat 117 85 42 17   115 112 1 27   19 61 28 13   35 14 118   1 89 151 161 1206
Total diatoms used in BIDI calculation 120 124 104 36   116 116 15 39   21 198 33 15   50 94 122   2 102 166 183 1656
Numerator used in BIDI 2 32 34 12   1 3 12 7   1 72 3 1   13 76 3   1 8 8 12
Denominator used in BIDI 120 124 104 36   116 116 15 39   21 198 33 15   50 94 122   2 102 166 183
BIDI Value 0.02 0.25 0.32 N/A   0.00 0.02 N/A N/A   N/A 0.36 N/A N/A   N/A 0.80 0.02   N/A 0.07 0.05 0.06
Intertidal Zone/Comment tidal flat low marsh low marsh most spp. fresh to slightly brackish   tidal flat tidal flat most spp. fresh to slightly brackish most spp. fresh to slightly brackish   most spp. fresh to slightly brackish low marsh most spp. fresh to slightly brackish most spp. fresh to slightly brackish   most spp. fresh to slightly brackish high marsh tidal flat   innumerable slide tidal flat tidal flat tidal flat
Earthquake indicated? Probably; this may indicate a drop into the intertidal zone from a low marsh environment.   Probably; this may indicate a drop from an upland area down to the lowest level of the intertidal zone   Possibly; this may indicate a drop into the intertidal zone from an upland area followed by re-emergence.   Possibly; evidence for emergence or aggradation present.   Possibly; evidence for sudden emergence or aggradation present, possible missing section.