SciELO - Scientific Electronic Library Online

vol.22In vitro bioaccesibility and release kinetics of phenolic compounds from guava (Psidium guajava L.) and soursop (Annona muricata L.) pulpProteus mirabilis expressing Plasmid-encoded toxin (Pet) causes urinary tract alterations author indexsubject indexsearch form
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


TIP. Revista especializada en ciencias químico-biológicas

Print version ISSN 1405-888X


SANCHEZ-BERISTAIN, Francisco  and  REITNER, Joachim. Microbialite-dominated fossil associations in Cipit Boulders from Alpe di Specie and Misurina (St. Cassian Formation, Middle to Upper Triassic, Dolomites, NE Italy). TIP [online]. 2019, vol.22, e171.  Epub Mar 04, 2020. ISSN 1405-888X.

In this paper we describe four new fossil associations of "reef and "reef'-like environments of the St. Cassian Formation (Ladinian-Carnian, Dolomites, NE Italy), based on thirty thin sections from 10 "Cipit boulders" olistoliths, which slided from the Cassian platform into coeval basin sediments. The fossil associations were determined by means of microfacies analysis using point-counting and visual estimation, as well as with aid of statistical methods, based on all fractions with a biotic significance (biomorpha and microbialites). Cluster Analyses in Q-Mode were performed, coupling three algorithms and two indices. In all samples, the main components of the framework are microbialite (average of 75%), and macrofossils (average of 20%), whereas cements and allochtonous components, such as allomicrite, do not represent a significant fraction. Based on both microbialite and fossil content, Chaetetid-microencruster Association, Microbialite-microencruster Association, Dual-type Microbialite Association and Microbialite-7ereèella Association, were differentiated. The palaeoenvironmental settings where the associations come from are separately discussed. Microencrusters helped determine energy and luminosity settings. Microencruster abundance and diversity, in addition to the conspicuousness of microbialite, indicate that all associations come either from a deep, or from a cryptic setting.

Keywords : Microbialite associations; Microencrusters; Cluster analysis; olistoliths; St. Cassian-Formation - Triassic; Dolomites.

        · abstract in Spanish     · text in English     · English ( pdf )