TABLE 1. Summary of the data analyzed and their main features. Benthic forms are in grey boxes.

Planktic
foraminifers
Benthic
foraminifers
Ammonites Bivalves
Sections 3 4
Samples 184 184 93 93
Species 85 211 28 42
Individuals 134958 37806 57 233
Average section similarity 58.3 44.3 37.5 54.7
Time interval 13 my 13 my 13 my 13 my
Distance among sections 130 km 130 km 20 km 20 km
Log distance among sections 2.1 2.1 1.3 1.3
Contradictions 159 569 7 100
Average section similarity 58.3 44.3 37.5 54.7
Unitary Associations (UAs) 32 29 8 8
Cliques in cycles 0 14 3 6

 

TABLE 2. List of the parameters used to calculate the Index of Stratigraphic Potential (ISP). Higher/positive total score value indicates higher stratigraphic potential. Benthic forms are in grey boxes.

  Non-normalized Normalized
Parameter Ammonites Planktic
 foraminifers
Bivalves Benthic
foraminifers
Ammonites Planktic
foraminifers
Bivalves Benthic
foraminifers
UAs/Species 0.29 0.38 0.19 0.14 0.62 1.00 0.22 0.00
% species confined to single UA 46.43 18.82 14.29 2.84 1.00 0.37 0.26 0.00
Average R 0.42 0.60 0.60 0.66 0.00 0.76 0.77 1.00
Shannon diversity index 0.54 2.00 1.70 3.30 0.00 0.53 0.42 1.00
Contradictions/samples number 0.08 0.86 1.08 3.09 0.00 0.26 0.33 1.00
Cliques in cycles 3.00 0.00 6.00 14.00 0.21 0.00 0.43 1.00
Average species duration 0.70 2.40 7.30 6.20 0.00 0.26 1.00 0.83
Average D 0.98 0.26 0.65 0.14 1.00 0.14 0.60 0.00
ISP         0.41 1.99 -0.69 -0.83