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TABLE 1. Sample locations along with geographic coordinates and depth (m).

Sample Id Depth
(m)
Station Latitude and Longitude
S1 20 Off Mahabalipuram N 11°34.00’, E 80°15.81’
S2 32 N 11°34.00’, E 80°25.50’
S3 63 N 11°34.00’, E 80°34.89’
S4 8 Off Palar River N 12°27.00’, E 80°10.20’
S5 21 N 12°27.00’, E 80°14.00’
S6 35 N 12°27.00’, E 80°21.30’
S7 63 N 12°27.00’, E 80°34.20’
S8 8 Off Edierthittu N 12°15.50’, E 80°02.00’
S9 28 N 12°15.50’, E 80°07.50’
S10 46 N 12°15.40’, E 80°11.30’
S11 71 N 12°15.40’, E 80°15.16’
S12 86 N 12°15.40’, E 80°22.20’
S13 156 N 12°15.40’, E 80°22.70’
S14 205 N 12°15.44’, E 80°23.24’
S15 6 Off Kazhikuppam N 12°07.00’, E 79°56.00’
S16 25 N 12°07.00’, E 80°05.03’
S17 53 N 12°07.00’, E 80°09.05’
S18 79 N 12°07.00’, E 80°10.00’
S19 100 N 12°07.00’, E 80°10.05’
S20 167 N 12°07.00’, E 80°11.00’
S21 176 N 12°07.00’, E 80°12.00’
S22 9 Off Muthialpet N 11°56.40’, E 79°51.50’
S23 26 N 11°56.41’, E 79°59.01’
S24 51 N 11°56.50’, E 80°03.05’
S25 91 N 11°56.50’, E 80°04.05’
S26 138 N 11°56.50’, E 80°05.30’
S27 176 N 11°56.50’, E 80°06.05’
S28 308 N 11°56.50’, E 80°07.00’
S29 8 Off Gingee River N 11°52.00’, E 79°50.20’
S30 25 N 11°52.00’, E 79°55.50’
S31 45 N 11°52.00’, E 79°57.07’
S32 95 N 11°52.00’, E 79°58.60’
S33 130 N 11°52.00’, E 79°59.00’
S34 149 N 11°52.00’, E 80°00.00’
S35 229 N 11°52.00’, E 80°04.50’
S36 11 Off Ponnaiyar River N 11°46.00’, E 79°49.74’
S37 32 N 11°46.00’, E 79°54.35’
S38 74 N 11°46.00’, E 79°59.95’
S39 9 Off Cuddalore N 11°42.00’, E 79°49.20’
S40 15 N 11°42.00’, E 79°53.50’
S41 26 N 11°42.00’, E 79°58.00’
S42 75 N 11°42.00’, E 79°59.30’
S43 119 N 11°42.00’, E 79°59.50’
S44 161 N 11°42.00’, E 79°59.80’
S45 282 N 11°42.00’, E 80°00.70’
C1 40 Off Chennai N 12°37.61’, E 80°17.52’
C2 51 Off Edierthittu N 12°02.64’, E 80°05.39’
C3 13 Off Cuddalore N 11°45.04’, E 79°48.04’

 

 

 

TABLE 2. List of species showing >5% abundance in surface sediment samples.

Sample Id S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12
Depth (m) 20 32 63 8 21 35 63 8 28 46 71 86
Ammonia beccarii 22 13 16 37 4 3 5 22 22 10 4 8
Rotalidium annectens 34 21 8 5 7     12        
Asterorotalia dentata 3 11           25   2    
Rotalinoides compressiuscula 21 31 3 14     5 34 31      
Quinqueloculina subparkeri 7 5 11   2     5     1 2
Quinqueloculina seminula 14 19 4 7 2 20 19 20 7 13 10 23
Lachlanella barnadi 14     13     4 3 3   2  
Quinqueloculina lamarckiana   3 10 6 8       3   1  
Quinqueloculina agglutinans 31 5 10 5 5 16 11 4 2 19 3 7
Triloculina trigonula 10   3         21       4
Triloculina insignis 9   10   7 4   8   2   2
Triloculina tricarinata 5   3 12     4 10 6   1 8
Amphistegina radiata 28 8 28 6 8 83 50   10 59 55 51
Amphistegina lessonii 3       17 12 17     26 3 16
Amphistegina papillosa   6 9   8 15 9   2 30 27 30
Amphistegina gibbosa           8 3       4 21
Amphistegina bicirculata                   9 17 22
Elphidium crispum 14   6 7 3 31 9 4 4 13 8 7
Elphidium advenum var. depressulum 13     13       5 3 3   14
Elphidium macellum 17   3 12         6      
Textularia agglutinans 3 16 8     2     6 13 4 8
Spiroplectammina sagittula           2 4   2 7 7 5
Cibicides wuellerstorfi 16 13   69   3 10 9 37 4 9  
Cibicides praecinctus     15             11 1  
Cibicides kullenbergi         2 9 6   9   9 15
Nonionellina labradorica   5   10       8 2      
Nonionoides elongatum 2 4   19     3 15 6      
Nonion commune               11 10      
Eponides repandus 2             4     1 8
Operculina ammonoides   5 33     4     7 10 9  
Operculina granulosa     5   1 11 4 3 6 24 12 13
Rosalina globularis       20     4   10      
Lenticulina orbicularis     16       9     4 3 5
Rotalinoides gaimardi   6         3          
Pararotalia nipponica             10   1 2    
Neorotalia calcar                        
Globigerinoides sacculifer 3 5 25 7 1 2 4 7 39 12 34 7
Neogloboquadrina dutertrei   3       2     5 3 20  
Globigerinella calida   2 2 2     1 2 11   2 1
Globigerina bulloides   4     1 1     2 1    
Globigerinoides ruber   1 2       3   2 3 5 5
Globigerinella siphonifera   6         1 1 2 1 1  

 

 

 

TABLE 3. List of species showing >5% abundance in the core sample C1 (Off Chennai).

Depth (cm) 1 2 3 4 5 7 9 11 13 15 17
Riminopsis asterizans 3 5 7 5 1     3 4 2 2
Nonionellina labradorica 33 19 42 32 18 33 12 25 10 22 25
Nonionoides boueana 10 18 18 10 12 15 10 13 20 6 15
Nonionina elongata 6 5 7 1   2 10 12 2 3 3
Nonion commune 17   9 1 3   6 6 8 7 15
Nonionoides turgida 4   1   1   8 9   3 4
Nonionoides grateloupii   2         10 2 1    
Cibicides wuellerstorfi 53 20 32 25 11 3 44 32 22 44 41
Cancris auriculus 2 2   2       2 1 2 8
Rotalinoides compressiucula 12 32 43 34 28 28 31 23 28 29 24
Asterorotalia dentata 5 15 8 11 20 18 6 12     3
Asterorotalia pulchella 28 11 21 31 46 23 10 17 25 9 5
Rotalidium annectens 4 21 34 25 73 43 7 2 34 6 3
Ammonia beccarii 17 10 8 2   5 17 20 4 26 13
Amphistegina radiata 3     2     4 2   4 1
Bolivina persiensis 2 3   1     5 3   12 6
Bolivina striatula 1 4   2     6 3   4 2
Bolivina spathulata             21 1   6 29
Pseudobrizalina lobata   2         2       2
Bulimina marginata 1           2   1   1
Siphouvigerina proboscidea   3         5     3 4
Stainforthia fusiformis 1 3         5     3 4
Textularia pseudogramen 8 7 2 4 10 5   8 17 2 3
Sahulia conica 6 12 4 5 12 19 5 9 19 9 5
Textularia agglutinans   6 10 5 16 13 3 4 8 6 1
Bigeneria nodosaria 3 18 14 12 33 21 2 8 25 5 5
Quinqueloculina undulose costata 1 2 5 1   2   1 6 5 2
Quinqueloculina seminula 2 3 1 3   8 10   5 10 5
Quinqueloculina lamarckiana   4 4 3 10 4 2 6 4 4 4
Massilina laevigata     1     2 2     3 2
Quinqueloculina bosciana   4         2     3 7
Miliolid sp. 2 6 3 5 1 4   1 3 2 2
Rosalina globularis   5         10 4   6 9
Martinottiella cylindrica   3   3 3 3 5 6 5 2  
Globigerina bulloides 15 8 5 13 9 12 9 4 6 13 7
Globogerinoides sacculifer 13 16 19 11 17 15 9 14 16 22 10
Globigerinella calida 5 10 5 11 15 4 9 3 2 8 9
Globigerinella aequilateralis 4 11 5 5 6 2 6 7 3   5
Globigerinoides ruber 2 4 8 5 5 3     2 2  
Neogloboquadrina duetertrei 5 4 8 16 15 9 3 7 8 4 5

 

 

TABLE 4. List of species showing >5% abundance in the core sample C2 (Off Emerald Island).

Depth (cm) 1 2 3 4 5 7 9 11 13 15 17
Quinqueloculina seminula 15 14 9 8 7 3 8 10 9 11 16
Quinqueloculina lamarckiana 20 15 12 7 14 9 8 17 13 4 8
Quinqueloculina laevigata 11   7 5 6 3 6 15 20 9 9
Quinqueloculina parkeri 3 4   2 3 7 2 2 3 2 5
Quinqueloculina agglutinans 14 6 4 10 24 12 15 15 3 12 5
Quinqueloculina barnadi   4 6 2 5 3 2   4 5 3
Quinqueloculina undulose costata     5 4   2   1 3 3 3
Quinqueloculina bosciana       5 3     10 4   5
Miliolid sp. 2     2 3     3     4
Miliolinella circularis   3   2 4     2 4 2  
Triloculina insignis 12 12   3 5 6 6 4 3 8 9
Pseudotriloculina sp. 8 4   3     2 1     5
Triloculina trigonula 4 11 9 12 10 11 7 7 4 23 9
Triloculina echinata 2 4   5   5 1 1   3 4
Triloculina tricarinata 2 11 8 3 6 7 8 6 13 13 15
Spiroloculina depressa 4 5   3 7 6 3 3 6 3 3
Spiroloculina excavata 2 3   2 3   2 2 3 3  
Spiroloculina orbis 4 3 5 3   5   1   3  
Spiroloculina sp.         7 4 1 3   3 4
Ammonia beccarii 16 15 22 23 13 24 23 10 30 13 15
Asterorotalia dentata 4 7 7 3 6 9 7 3 3 5 4
Rotalidium annectens 8 19 7 16 8 8 7 4 3   16
Ammonia tepida           2 1   9 2 3
Rotalinoides compressiuscula 21 15 17 24 11 28 23 19 17 21 14
Amphistegina radiata 4 3 5 2     1 1 4 3 3
Cribroelphidium excavatum 30 22 19 20 17 20 15 4 5 8 11
Elphidium crispum 15 12 17 8 12 11 17 7 13 20 13
Elphidium macellum 21 18 28 13 18 25 13 3 10 8 6
Elphidium asiaticum 8 6 8 4 5 7 4 2 5 8 3
Cibicides wuellerstorfi 46 44 51 38 45 28 68 66 63 39 41
Lobatula lobatula 6       7 4 4        
Nonionoides boueana     6 4 3   1 2 4 5 3
Nonionella labradorica 4   5 8   2 1 4   3 3
Nonionoides elongatum 10 11 14 9 11 13 22 20 17 19 22
Nonion commune 4 5 6   5   3 4   2 8
Riminopsis asterizans   5   4 3 3 5 1   2  
Pararotalia calcariformata 7 6 6 4 3 7 1 1 3 4 3
Operculina granulosa                   5 3
Rosalina globularis     5 6 8 5 3 17 15 3 7
Asterorotalia inflata       2              
Globigerina bulloides 5 4 4 2 5 4 2 3   3 6
Globigerinoides sacculifer 3   6 6 5 3 2 5 7 6 8
Globigerinella calida   3   5 4 2   3 3 3 3
Globigerinoides ruber       2 3 2 2     2  

 

TABLE 5. List of species showing >5% abundance in the core sample C3 (Off Cuddalore).

Depth (cm) 1 2 3 4 5 7 9 11 13 15 17
Nonionoides elongatum 11 7 18 38 18 9 15 16 11 18 8
Nonion fabum 27 9 26 18 11 12 21 30 10 19 2
Nonionellina labradorica 45 93 87 57 84 90 98 75 63 53 99
Elphidium asiaticum 5 1   3     1 2 2 2 4
Spiroloculina excavata 3 2 2 3 7 1     2 1 1
Spiroloculina antillarum 2 8 12 8 7 11 9 1 4 4 3
Spiroloculina depressa 1 1 1 3 2 5 5 1 1 4 1
Ammonia beccarii 11 13 6 12 13 10 12 6 27 19 28
Asterorotalia dentata 5 9 12 13 14 12 5     2 9
Ammonia tepida 1 1   2 3   4 18 36 14 3
Triloculina tricarinata 5 9 3 7 8 12 3 6 8 8 11
Triloculina trigonula 10 20 13 4 11 9 9 8 9 16 4
Elphidium crispum 21 31 19 22 17 16 25 22 17 17 25
Elphidium hispidulum 6 12 5 6 5 11 10 10 3 8 7
Cibicides wuellerstorfi 34 24 19 33 23 22 24 24 33 32 34
Lobatula lobatula 4 3   2   2 10 1 1    
Cibicides kullenbergi 1 1 1 2 1 2 1   1   2
Quinqueloculina lamarckiana 4 8       6 3 1 2 1  
Adelosina longirostra 2   1 2   1   1 3 12 12
Rotalinoides compressiuscula 6 2 4 3 6 8 8 11 10 21 16
Rotalidium annectens     2 4 3   9 3   4  
Neorotalia calcar 8 12 3 2 2 2          
Globigerina bulloides   1   2 5 7 7 4 3 5 8

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