Silicified dolomite of the approximately one billion year old Skillogalee Dolomite of the Adelaide Geosyncline, South Australia, contains organically preserved microfossils of a structurally complex, crustose pleurocapsalean cyanophyte, herein described as Paleopleurocapsa wopfnerii. Although actual cell contents have been degraded, lamellar sheath material faithfully preserves the morphology o...

In this contribution, we investigated the chemical composition of Precambrian microfossils from Gunflint chert (1.88 Ga) using a miniature laser ablation ionization mass spectrometer (LIMS) developed for in situ space applications. Spatially resolved spectrometric imaging (MSI) and depth profiling resulted acquisition 68,500 spectra. Using single unit spectral decomposition multivariate data an...

Abstract. We report on Precambrian microfossils from igneous rocks of the Volyn pegmatite district, associated with Paleoproterozoic Korosten pluton, northwestern Ukraine. The fossils were recovered meter-sized miarolitic cavities and show a well-preserved 3D morphology, mostly filamentous but large variety types also in irregular, flaky shapes reminiscent former biofilms, as well rare spherica...

Many boreholes have been drilled between Černá Hora town and Závist village to evaluate geohazards that may affect the construction of a new road. The core material from was studied for translucent heavy minerals microfossil content. Translucent mineral assemblages sands are often dominated by staurolite. Cyanite, tourmaline, rutile andalusite, typical Cenomanian sediments Moravia common. Relat...

Allison, C.W. and Awramik, S.M., 1989. Organic-walled microfossils from earliest Cambrian or latest Proterozoic Tindir Group rocks, northwest Canada. Precambrian Res., 43: 253-294. Uppermost Tindir Group limestones exposed in the headwaters of Tindir Creek, Yukon Territory, Canada, contain a diverse and abundant microbiota of mineralized and organic-walled microfossils. Preserved primarily in c...

The organic-walled microfossil Chuaria circularis [Walcott, C.D., 1899. Precambrian fossiliferous formations. Geol. Soc. Am. Bull. 10, 199–244] Vidal and Ford [Vidal, G., Ford, T.D., 1985. Microbiotas from the Late Proterozoic Chuar Group (Northern Arizona) and Uinta Mountain Group (Utah) and their chronostratigraphic implications. Precambrian Res. 28, 349–389] from the Visingsö Group in Sweden...

Cryptoendolithic microbial communities living within Antarctic rocks are an example of survival in an extremely cold and dry environment. The extinction of these micro-organisms formerly colonizing sandstone in the Mount Fleming area (Ross Desert), was probably provoked by the hostile environment. This is considered to be a good terrestrial analogue of the first stage of the disappearance of po...