Bodega 1998 Drive Cores - Diatom Counts and BIDI Calculation
Sample Number 98 BB
D1-3 		98 BB
D1-4 		98 BB
D1-5 		98 BB
D1-6 		98 BB
D1-7 		98 BB
D1-8 		98 BB
D1-9 		98 BB
D1-12 		98 BB
D1-13 		98 BB
D1-14 		  98 BB
D2-3 		98 BB
D2-4 		98 BB
D2-5 		98 BB
D2-11 		98 BB
D2-12 		98 BB
D2-13 		98 BB
D2-14 		98 BB
D2-15 		98 BB
D2-20 		98 BB
D2-21 		total counted
Depth (cm) 41.5 45.0 59.0 62.5 77.5 80.0 84.0 101.5 103.0 106.0   53.0 57.0 60.5 100.0 108.0 117.5 121.5 124.0 156.0 166.0
                                             
Achnanthes brevipes 1 1 5 1 3   4 3 1 1 2 22
Achnanthes delicatula 2   2
Achnanthes hauckiana 6 3 15 1 1   6 24 7 26 5 13 5 14 126
Achnanthes lanceolata 18 43 20 4 1   2 88
Actinoptychus senarius 1   1 2
Amphora coffeiformis   2 41 8 42 4 1 2 100
Amphora granulata 2 1 2 2   2 1 2 12
Amphora ventricosa 1 2 1 1 2 13   1 21
Arachnodiscus ehernbergii   1 1 2
Bacillaria paradoxa   4 1 5
Caloneis bacillum 1 3 3 1 6 7 13   1 17 1 18 1 6 78
Caloneis westii 1 2 7   2 2 1 7 2 2 26
Cocconeis costata 1   2 2 3 2 5 5 20
Cocconeis diminuta 5   3 8
Cocconeis dirupta 1 4 5 1   11
Cocconeis pellucida 1 1 1 6 4 1   3 11 6 18 16 8 2 11 10 99
Cocconeis placentula 1 1   1 3 4 2 2 4 18
Cocconeis placentula var. euglypta 1   1
Cocconeis scutellum 1 32 1 20 9   12 18 7 5 30 14 149
Cocconeis scutellum var. parva 2 35 30 16 1   2 5 28 15 9 1 20 3 167
Coscinodiscus radiatus   1 1
Cosmioneis pusilla 5 5 1   8 19
Cyclotella striata   1 1 2
Cymbella cuspidata 1 6   7
Denticula subtilis 10 2   1 2 1 16
Diploneis didyma   1 1 2
Diploneis interrupta 1   1
Diploneis pseudovalis 9 1 5 4 6 3   1 12 2 4 1 7 55
Diploneis smithii var. rhombica 2 5 16 4 6   32 2 67
Eunotia lunaris 43 6   49
Eunotia polydentula 7   7
Eunotia praerupta 4   4
Fragilaria exigua 1 144 9 42 9 8   25 238
Frustulia vulgaris 2 5 2   3 12
Gomphonema angustatum 17   17
Gomphonema parvulum 65 2   67
Gomphonema tenellum 16 50 4 1   71
Grammatophora marina 1 1 1   1 4
Gyrosigma accuminatum 9 2   1 1 1 1 15
Gyrosigma balticum 1   1 1 3
Gyrosigma exmium 1 1 3   14 1 9 1 3 33
Hyalodiscus laevis   4 4
Hyalodiscus scoticus   1 4 5
Luticola mutica 19 13 2 1   1 2 16 1 4 59
Mastogloia exigua   6 1 7
Melosira nummuloides   1 1
Navicula cari 5   13 18
Navicula cincta 1 1 2   1 1 1 4 11
Navicula crucicula 1   1
Navicula cryptocephaloides 2   2
Navicula cryptotenella 3 3 4 5 2 77 1 3 3   1 54 7 1 6 22 10 22 224
Navicula digitoradiata 1 1 2   2 2 3 1 12
Navicula elegans 1 8 12   1 2 24
Navicula halophila 3   1 3 3 1 1 5 17
Navicula pygmacea 1 1   2 2 2 5 13
Navicula radiosa 1 5 39 17 3 3 21 13 9   2 16 1 16 13 31 190
Navicula salinarum 3 2 3 12 2 23   6 6 4 9 9 79
Navicula tenelloides 9 22 7 40   1 8 4 2 1 26 13 4 20 157
Navicula tripunctata 1 4 25 23 5 1   6 16 30 3 6 36 1 2 159
Nitzschia fasciculata 1 16 2   4 1 1 1 26
Nitzschia frustulia var. subsalina 35 17 4 1   57
Nitzschia granulata   1 1
Nitzschia holsatica 19   19
Nitzschia ignorata 11   11
Nitzschia Kutz. 36   2 8 46
Nitzschia scapelliformis 12 7 1 10 2 1   22 7 2 1 65
Nitzschia sigma 6 2 5 15 14 26   3 2 3 3 6 7 17 109
Nitzschia terrestris 7   7 1 1 16
Odontella aurita   1 1
Opephora parva 2 10 12 6   2 18 55 42 3 3 11 2 166
Paralia sulcata - small 1   1 2 4
Paralia sulcata - large   1 1
Pinnularia brevicostata 1   1
Pinnularia divergens 4 5 1 5   15
Pinnularia gentilis 2   2
Pinnularia lagerstedtii 8 7 1   18 20 1 55
Pinnularia streptoraphe 1 1   2
Plagiotropis vitrea   1 1
Rhoicosphenia marina 1 15 18 17   2 7 15 4 2 1 10 3 95
Rhopalodia musculus 2 3 2 10 14   4 7 24 1 3 70
Scolioplerua tumida   2 1 3
Sellaphora pupula 3   3
Stauroneis anceps 1   1
Stauroneis phonicenteron 1 1   2
Staurosira construens var. venter 23 4 23 1   51
Surirella brebissonii 5   5
Surirella fatuosa 1 1   8 10
Surirella ovata 4   4
Synedra fasciculata 5 6 27 1 23 28 9   1 8 17 23 39 45 5 18 8 263
Synedra fulgens   5 5
Thalassiosira eccentrica   1 1
Thalassiosira pacifica   1 1
Trachneis aspera 1   1 3 5
Tryblionella accuminata 1 1 1   4 1 1 9
Tryblionella aerophila 2 6 1 1 6   1 3 1 1 7 29
Tryblionella coarctata   1 2 3
Tryblionella levidensis 6 4   1 11
Tryblionella plana 1 10 1   1 13
Tryblionella punctata 1   1 1 17 20
Indeterminate 1 2 3 3 1 3 1 4 4 4   2 2 3 1 1 2 1 2 1 1
                                             
Preservation VG G VG VG VG VG VG VG VG VG   F G VG VG VG VG G VG VG VG
Total Diatoms Counted 236 209 162 179 357 167 207 190 190 136   31 140 191 219 176 177 275 227 166 223 3832
Total High marsh 0 9 54 13 52 0 0 3 1 8   26 10 35 2 0 2 28 15 5 29 292
Both Low and High 2 20 26 10 10 1 16 12 13 19   2 5 32 0 1 1 4 42 4 21 241
Total Low Marsh 0 17 17 22 15 2 82 8 23 28   1 96 18 0 0 2 23 95 16 31 496
Total Tidal Flat 1 1 11 64 36 109 8 101 84 58   0 19 47 115 114 107 114 14 89 50 1142
Total Diatoms Used in BIDI Calculation 3 47 108 109 113 112 106 124 121 113   29 130 132 117 115 112 169 166 114 131 2171
Numerator for BIDI 2.0 37.5 88.5 34.0 69.5 2.0 57.0 19.0 25.5 41.0   28.0 63.0 76.0 2.0 1.0 4.0 43.5 104.5 17.0 65.5
Denominator for BIDI 3.0 47.0 108.0 109.0 113.0 112.0 106.0 124.0 121.0 113.0   28.5 130.0 132.0 117.0 115.0 112.0 169.0 166.0 114.0 131.0
BIDI Value N/A N/A 0.82 0.31 0.62 0.02 0.54 0.15 0.21 0.36   N/A 0.48 0.58 0.02 0.01 0.04 0.26 0.63 0.15 0.50
Intertidal Zone/Comment almost all fresh water spp. sparse slide; most fw spp. high marsh low marsh low marsh tidal flat low marsh tidal flat tidal flat low marsh   reworked high marsh deposit? low marsh low marsh tidal flat tidal flat tidal flat tidal flat low marsh tidal flat low marsh
Earthquake indicated? aggrading marsh or possible storm deposits emergence indicated-storm deposit? or aggrading marsh possibly; temporary drop in intertidal level is detected possibly, sudden drop in intertidal level   storm deposit? marsh aggradation? lower, but still a low marsh deposit possibly; sudden, lasting lowering into tidal flat zone no, probably represents aseismic low marsh erosion