UTRECHT MICROPALEONTOLOGICAL BUllETINS

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ently favoured clayey substrates but were incapable of pushing the B/P ratios to notably higher values. The increased species diversity in the middle (CR 42-45) but especially in the upper part of the Trubi (PP 1-7), indicate favourable bottom environments. The latter seem to be brought about by an increased supply of terrigenous fines, possibly a consequence of an encroaching hinterland. The presence of small specimens of Chama in sample PP 3 may support the latter hypothesis. Distribution of species In the lower 6 to 7 m of vaguely bedded, compact limestones of section 3 Dentalina filiformis, Epistominella exigua, Globocassidulina subglobosa, Gyroidina soldanii, G. umbonata, Oridorsalis stellatus, o. umbonatus and Valvulineria glabra are, in various combinations, the most frequent faunal constituents (samples 1393 to 1397). The frequency distribution of most of the benthonic foraminifera throughout section 3 is shown in the chart of fig. 16. The chart of fig. 17 shows that dominance rapidly shifts from one species combination to another. G. subglobosa, G. umbonata and o. stellatus recur with high frequencies in the overlying assemblages, whereas notable quantities of the others are more or less restricted to this lowermost interval. Some of them played an important role already in the transitional interval with the underlying Arenazzolo (Brolsma, 197 5b). The large numbers for D. filiformis result in part from fairly numerous broken specimens, the fragments of which have been counted as complete individuals. D. filiformis, E. exigua, G. soldanii and o. umbonatus are dominant elements in the lower part of the Trubi at Capo Rossello, as well as in the Trubi type intercalation in the topmost Arenazzolo at Eraclea Minoa (cf. figs. 5 and 16). Eggerella bradyi, Karreriella bradyi, Uvigerina peregrina, U. pygmea, Cibicides bradyi and Oolina hexagona are additional common elements with fluctuating relative weight in the overlying 10 m of alternating marly and indurated limestones (samples 65 to 1400). The latter two species continue to be present in equally high numbers in the following samples. Florilus grateloupi, Hanzawaia boueana, Uvigerina peregrina and U. pygmea form dominant faunal elements(> 5%) in this interval only. Siphonina bradyana starts to increase in numbers in sample 1399. Globocassidulina subglobosa disappears as a common element but returns in smaller proportions in the middle and upper parts of section 3. The following 10m of more thick bedded limestones show a strong increase of S. bradyana and Pullenia species. Also Lagena and Fissurina as a group become more numerous in this interval.
Page 1 and 2: UTRECHT MICROPALEONTOLOGICAL BUllET
Page 3 and 4: QUANTITATIVE FORAMINIFERAL ANALYSIS
Page 5 and 6: The foraminifera. . . . . . . . . .
Page 7 and 8: Benthonic and planktonic foraminife
Page 9 and 10: and considerable lowering of the er
Page 11 and 12: topmost Messinian evaporites, chara
Page 13 and 14: literature together with Pachysphae
Page 16 and 17: Data and conclusions from the earli
Page 18 and 19: 2 3 Ammonia beccarii Bolivina dente
Page 20 and 21: LITHOLOGY The new exposure to be de
Page 22 and 23: may interfinger. Evidently biogenic
Page 24: CONCLUSIONS The mediocre preservati
Page 27 and 28: 107 107G B.C 107A 106 1394 64 1393
Page 29 and 30: Fig. 9 Laterally displaced loadcast
Page 31 and 32: Orbulina, which in turn seem to dep
Page 33 and 34: 0 10 20cm. L--L--J ~II\\ :::0 if.-
Page 35 and 36: whether its assumed intermediate st
Page 37 and 38: cate that larger burrowing organism
Page 39 and 40: The foraminiferal faunas from the T
Page 41 and 42: 42 43 44 45 sa~ 3 4 4 Astrononion i
Page 43 and 44: the accumulation of silica-rich sed
Page 45: 1 1 i z 1 1 11 3 1 i ~ . 2 •• 7
Page 49 and 50: The next higher part of the section
Page 51 and 52: Cibicides pseudoungerianus appears
Page 53 and 54: In the next higher interval the alt
Page 55 and 56: high. It remains equally possible t
Page 57 and 58: I 106 55 52 j 8 Ij I " ~ ~ ! I ll11
Page 59 and 60: 107A 107B 107C 107D 107E 107F 107G
Page 61 and 62: of the faunas remains practically t
Page 63 and 64: 5 -- 4 3 2 7 - - - - - - - - - - -
Page 65 and 66: ;.Monica Say(32) Todos Santos 8ay (
Page 67 and 68: 1000 m, the latter corresponding to
Page 69 and 70: In this respect it is interesting t
Page 71 and 72: for this interval at the three loca
Page 73 and 74: near-absence and bloom. The level o
Page 75 and 76: Fig. 30 Punta Piccola section, show
Page 77 and 78: Chlorite/montmorillonite and albite
Page 79: most of them are of the order of 15
Page 83 and 84: The change in colour from cream to
Page 85 and 86: The foraminiferal faunas from the M
Page 87 and 88: , " ~ " , , . ~ . ~
Page 89 and 90: posite- reactions with higher a-val
Page 91 and 92: ------ Cibicides lobatu(us -- Hanza
Page 93 and 94: Bulimina inflata, Hopkinsina bononi
Page 95 and 96: Parker, 1954). In the Andaman Sea t
Page 97 and 98:
athymetric distribution is shown in
Page 99 and 100:
in the manganese-rich interbeds (B
Page 101 and 102:
50 1~N 47 46 45 43 4 M 42 L 41 4 39
Page 103 and 104:
Emiliani (1974) analyzed core mater
Page 105 and 106:
20323, was deposited at the transit
Page 107 and 108:
it is realized that the latter two
Page 109 and 110:
FREQUENCY D ISTR I BUTION OF SOME S
Page 111 and 112:
BENTHONIC FORAMINIFERAL ASSOCIATION
Page 113 and 114:
IK < .o~
Page 115 and 116:
ed by the increase of epiphytes and
Page 117 and 118:
G. puncticulata, recorded from Aren
Page 119 and 120:
our sample 93 suddenly shows a B/P
Page 121 and 122:
loss may be due to the folding. The
Page 123 and 124:
shallowing tendency. This quiet sed
Page 125 and 126:
One of the major aims of this inves
Page 127 and 128:
anean evidently had a nutrient supp
Page 129 and 130:
A taxonomical treatment of all figu
Page 131 and 132:
Remarks: Globigerina pseudobesa (Sa
Page 133 and 134:
Remarks: Colalongo and Sartoni (196
Page 135 and 136:
30. Earland, A. (1934). Foraminifer
Page 137 and 138:
Anderson, G. ]. (1963). Distributio
Page 139 and 140:
Hsii, K. J., Cita, M. B. and Ryan,
Page 141 and 142:
Wright, R. (1977). Neogene paleobat
Page 144:
Figs. 1a-b Figs. 2a-b Figs.3a-b Fig
Page 148:
Figs. 1a-c Figs. 2a-c Figs. 3a-c Fi
Page 152:
Fig. 1 Fig. 2 Figs.3a-b Fig. 4 Fig.
Page 156:
Morphological gradation from Globor
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UTRECHT MICROPALEONTOLOGICAL BUllETINS

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