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Table 2 Calcareous nannofossil and benthic foraminifera assemblages of the Tiefengraben section

From: Bentho-planktonic evidence from the Austrian Alps for a decline in sea-surface carbonate production at the end of the Triassic

Section

Assemblage

 

Occurrence in section (m)

Characteristic

Other

Tiefengraben

PA + Sch

Nanno

From 17 to the top

Sparse small P. triassica and Schizosphaerellid fragments

 

Tiefengraben

PA

Nanno

From 12 to 15

Sparse P. triassica

 

Tiefengraben

Pt1

Nanno

From 0 to 1.5

P. triassica (20%) E. zlambachensis + E.tollmanniae (10-15%)

Orthopithonella spp. (<10%)

Obliquipithonella spp. (<10%)

Coccoliths (<1%)

Tiefengraben

PA

Benthic forams

From 23 to the top

Low abundant (~200 ind./g of sed.) and low diversified hyaline Nodosariidae. Paralingulina tenera

Very rare (<10 ind./gram of sed.) agglutinated taxa

Tiefengraben

AM

Benthic forams

From 17 to 23

Low abundant (<1,000 ind./g of sed.) and low diversified coarse agglutinated taxa. Ammobaculites cf. duncani, Ammomarginulina beggi

Low abundant (~100–300 ind./g of sed.) of small size hyaline taxa. Pseudonodosaria limpida

Tiefengraben

TROCHA

Benthic forams

From 13 to 15

Very abundant (~5,000 ind./g of sed.) low diversified agglutinated taxa. Trochammina squamosa, Glomospira perplexa

Very rare (<40 ind./g of sed.) hyaline taxa

Tiefengraben

DN

Benthic forams

From 0 to 1.5

Abundant (~1,000 ind./g of sed.), diversified hyaline Nodosariidae. Pseudonodosaria limpida, P. plurimicostata, Prodentalina subsiliqua, P. paucicurvata, Astacolus pediacus

Low abundant Polymorphinidae (~200 ind./g of sed.). Eoguttulina liassica

  1. Calcareous nannofossil assemblages: Pt1, P. triassica assemblage with large forms; PA, poor assemblage; PA + Sch, poor assemblage + “Schizosphaerellids”. Benthic foraminifera assemblages: DN, diversified Nodosariidae; TROCHA, Trochammina; AM, Ammobaculites-Ammomarginulina; PARA, Paralingulina tenera