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Upper Jurassic to Lower Cretaceous Dasycladales of the Northern Calcareous Alps: the state of knowledge

 

Distribution of Dasycladales in the Northern Calcareous Alps

Dasycladales distribution and stratigraphy
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The Dasycladales species known from literature reveal particular spatial and chronostratigraphic distributions. Among the 27 known species, 20 occur in more than one locality. The five most frequent species occur in both of the tectonic units: E. jurassica (6 localities), S. annulata (10 localities), S. pygmaea (12 localities), A. podolica (6 localities), C. jurassica (11 localities). The less frequent species known from more than one locality are restricted to one tectonic unit: Tyrolic: N. socialis (3 localities), S. johnsoni (2 localities), P. bursiformis (4 loc.). Juvavic: M. praturloni (2 localities), S. sellii (4 localities), Z. embergeri (2 localities), C. catinula (2 localities), C. ? solkani (3 localities), A. elongata (2 localities).

Gallery - click images to enlarge
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Clypeina ? solkani,
various sections,
Locality: Plassen,
Plassen Formation
Campbelliella striata,
oblique section showing typical striation,
Locality: Plassen,
Plassen Formation
c_striata_2.jpg
c_solkani_2.jpg Clypeina ? solkani,
various sections,
Locality: Plassen,
Plassen Formation
c_striata_1.jpg Campbelliella striata,
longitudinal section,
Locality: Plassen,
Plassen Formation
Clypeina sulcata,
longitudinal section,
Locality: Plassen,
Plassen Formation
c_sulcata_1.jpg Campbelliella striata,
oblique section,
Locality: Plassen,
Plassen Formation
c_striata_3.jpg
c_sulcata_2.jpg Clypeina sulcata,
oblique section,
& Mohlerina basiliensis,
Locality: Barmstein,
Barmstein Limestone
s_gr_pygmaea_1.jpg Salpingoporella gr. pygmea,
Locality: Krahstein,
Plassen Formation
Clypeina sulcata,
cross section,
& Campbelliella striata,
Locality: Plassen,
Plassen Formation,
c_sulcata_3.jpg Salpingoporella gr. pygmea,
Locality: Krahstein,
Plassen Formation
s_gr_pygmaea_2.jpg
n_socialis_1.jpg Neoteutloporella socialis,
oblique cross sections,
Locality: Trattberg,
Barmstein Limestone
p_bursiformis.jpg Petrascula bursiformis,
Locality: Rötelstein,
Plassen Formation
Neoteutloporella socialis,
longitudinal sections,
Locality: Trattberg,
Barmstein Limestone
n_socialis_2.jpg Pseudoepimastopora jurassica,
Locality: Plassen,
Plassen Formation
p_jurassica.jpg
s_annulata.jpg Salpingoporella annulata,
longitudinal section,
Locality: Plassen,
Plassen Formation
 

Contents:

1. Start - Introduction

2. Localities and Geology

3. Lithostratigraphy and Facies

4. Relevance of Dasycladales Algae

5. Distribution of Dasycladales in the Northern Calcareous Alps (with algal images)

6. Restrictions and Problems

7. Perspectives for Further Studies and Literature Cited

 

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