Microfossil algae associated with Cretaceous stromatolites in the Tarahumara Formation, Sonora, Mexico

Mineralization of soft-part anatomy and invading microbes in the horseshoe crabMesolimulusfrom the Upper Jurassic Lagerstätte of Nusplingen, Germany

“…Proterozoic cherts yield microbial mat communities (Horodyski et al 1993) and examples have also been discovered in the Early Devonian Rhynie Chert (Kidston & Lang 1921), and as organic remains in Mesozoic cherts (Beraldi-Campesi et al 2004). Proterozoic-Cambrian phosphorites preserve a wealth of microbes (Zhegallo et al 2000;Doushantuo-type preservation of Butterfield 2003), and organically preserved and mineralized forms occur in other Cambrian settings, including the Burgess Shale (see review and listing in Peel 1988;Mankiewicz 1992).…”

Life cycle of 70 Ma-old non-marine pennate diatoms

“…Chain-forming pennate and centric diatoms have previously been described from this locality, and suggested to be related to modern Fragilariaceae, Tabellariaceae and Melosiraceae species (Beraldi et al, 2004;BeraldiCampesi, 2014). Members of the Melosiraceae, have been found to preserve stages of their life cycle as well as vegetative cells, such as patterns of cell division and size reduction typical of modern diatoms (Beraldi-Campesi, 2014).…”

“…The diatoms e both centrics and pennates e did not occur on their own but grew alongside other microbiota in a non-marine setting near volcanoes (Beraldi-Campesi et al, 2004;Beraldi-Campesi and Cevallos-Ferriz, 2005). The pennate diatoms in the chert display morphologies, cellular secretions, auxosporelike cells, and spatial arrangements and orientations that reflect the physiological and behavioral activity during life cycles of the species in a way that is not known from other fossil assemblages.…”

“…The Huepac Chert bears a great variety of microfossils, some of which are clearly diatoms (Beraldi-Campesi et al, 2004;BeraldiCampesi, 2014). The diatoms e both centrics and pennates e did not occur on their own but grew alongside other microbiota in a non-marine setting near volcanoes (Beraldi-Campesi et al, 2004;Beraldi-Campesi and Cevallos-Ferriz, 2005).…”

Síntesis de los trabajos paleobotánicos del Cretácico en México

“…Sin embargo, comparan la estructura floral con los sépalos persistentes fusionadas (corona terminal) de Meziella Schindler. Beraldi-Campesi et al), microalgas, acritarcos, polen (con granos de polen monosulcados probablemente relacionados con la familia Arecaceae), esporas, conidiosporas y fragmentos de artrópodos (BeraldiCampesi, 2000;Beraldi-Campesi y Cevallos-Ferriz, 2005;Beraldi-Campesi et al, 2004). El ambiente de depósito de los niveles con pedernal ya fue determinado litológicamente como fluvio-lacustre (González-León, 1994a) y la asociación de microfósiles anteriormente descrita corrobora un ambiente no marino principalmente por la presencia de diatomeas lacustres similares a las actuales Amphora Ehrenberg ex Kützing y Tabellaria Ehrenberg ex Kützing (Chacón-Baca et al, 2002), además del alga verde de tipo Tetraedron Kütz (Beraldi-Campesi, 2000) y la presencia de plantas fósiles.…”