Maastrichtian-Danian Dinoflagellate Cyst Biostratigraphy and Biogeography From Two Equatorial Sections in Colombia and Venezuela

Abstract

Two outcrop sections from the Maastrichtian Colón and Mito Juan Formations were analyzed for dinoflagellate cyst biostratigraphy. Samples from the Río Molino section (Cesar-Ranchería Basin, Colombia) represent a subset of samples from the 240 mthick hemipelagic limestones and calcareous mudstones reported in Martínez's (1989) foraminiferal study. The upper Campanian, lower Maastrichtian and uppermost Maastrichtian intervals were identified in this section based on some significant dinocyst biostratigraphic events, which are in agreement with planktonic foraminiferal data. In ascending stratigraphic order these events include the lowest occurrence (LO) of Areoligera spp., LO of Senegalinium spp., highest occurrence (HO) of Trichodinium castanea, HO of Xenascus ceratioides, LO of Cerodinium diebelii, LO of Trithyrodinium evittii, HO of Odontochitina operculata, LO of Phelodinium tricuspe, HO of Palaeohystrichophora infusorioides, LO of Glaphyrocysta perforata, LO of Disphaerogena carposphaeropsis and LO of Manumiella seelandica.

Campanian to Maastrichtian palynofacies and dinoflagellate cysts of the Silesian Unit, Outer Western Carpathians, Czech Republic

“…The first occurrence of C. diebelii and its related forms (Ypes 2001) is close to the Campanian/Maastrichtian boundary (Antonescu et al 2001, Roncaglia 2002. Williams et al (2004) reported that worldwide total distribution of ranges of C. diebelii is earlier in the Campanian.…”

Late Maastrichtian dinoflagellate cysts from the Cerro Butaló section, southern Mendoza province, Argentina

“…It was reported by Schiøler et al (1996) in the ENCI Quarry, Upper Maastrichtian Gulpen Formation, The Netherlands and by Yepes (2001) immediately below the K-T boundary in Rio Loro section, western Venezuela (northern South America).…”

“…Benson, 1976;Firth, 1987;Brinkhuis & Leereveld, 1988;. In northern South America, Yepes (2001) reported its occurrence in the upper part of the Maastrichtian. In the South Atlantic (Brazil) it has been found in the Campos Basin (Arai, 1994) in the uppermost Maastrichtian and also in the K-T boundary section of Pernambuco Basin (Sarkis et al, 2002).…”

“…Spiniferites/Achomospharera are cosmopolitan neritic genera (Head & Westphal, 1999). Yepes (2001), after a discussion about the environmental conditions indicated by the Spiniferites/ Achomosphaera group, concluded that environmental interpretations are still incomplete, as they could suggest a range of inner to outer neritic conditions. Based on the analysis of the situation of Cerro Butaló section in the basin, the high number of Spiniferites (Table 1) in coincidence with a high ratio of dinoflagellate cysts/terrestrial palynomorphs (Fig.…”

Les kystes de dinoflagelles et palynofacies de la transition Maastrichtien–Danien du stratotype El kef (Tunisie)

“…Par conséquent, le présent assemblage confirme un dépôt effectué dans une province tropicale à subtropicale ou téthysienne. Cet assemblage est reconnu dans les dépôts campaniens, maastrichtiens et daniens du bassin méditer-ranéen (Slimani et al, 2010 ;Soncini, 1990), au Sénégal (Jan du Chêne, 1988), dans les zones équatoriales (Masure et al, 1998 ;Oboh-Ikuenobe et al, 1998 ;Yepes, 2001) et dans le Moshkovitz et Habib, 1993a,b, échantillon Ka 4, lame L2, EF R49. 2 : Andalusiella mauthei Riegel, 1974subsp.…”