Palynology 

About: Palynology is an academic journal published by Taylor & Francis. The journal publishes majorly in the area(s): Pollen & Palynology. It has an ISSN identifier of 0191-6122. Over the lifetime, 948 publications have been published receiving 16633 citations.

Angiosperm pollen zonation of the continental Cretaceous of the Atlantic coastal plain and its application to deep wells in the Salisbury embayment

Abstract: This paper presents and illustrates an informal palynological zonation of the pre‐Magothy continental Cretaceous sediments of the Atlantic Coastal Plain (Potomac Group, Raritan Formation), based primarily on new and previously published studies of angiosperm pollen from two wells near Delaware City, Delaware, and from outcrop samples from Virginia through New Jersey, following lines established by Brenner (1963). Monosulcate angiosperm pollen (with columellar exine structure) is present from the base of Brenner's Zone I (Patuxent Formation and Arundel Clay equivalents, Barremian‐lower Albian?). Reticulate tricolpates enter in upper Zone I and diversify in Brenner's Subzones II‐A and II‐B (Patapsco Formation equivalents, middle‐upper Albian?); tricolporoidates appear in Subzone II‐B. Very small, psilate tricolporoidates and Rugubivesiculites rugosus enter in our Subzone II‐C (uppermost Albian?), larger triangular tricolporates and new tricolpates in Zone III (lower Cenomanian?); these two units ar...

Late and postglacial vegetational and paleoclimatic changes in subantarctic, temperate and arid environments in Argentina

Abstract: A paleoclimatic chronology for southern South America is suggested by comparison of dated pollen records from Argentina (lat 32° to 34°S, 41°S and 51° to 54°S). The paleoenvironmental phases distinguished for the last 13,000 years are interpreted as paleoclimatic phases and explained as latitudinal shifts of atmospheric circulation anomalies by using the correlation of modern precipitation patterns with atmospheric circulation anomaly patterns over Argentina and Chile. The lateglacial type environment is characterized at all sites in the high southern latitudes by pollen assemblages of grasses, composites, sedges, and heath, suggesting climates as cold and wet as the modern Magellanic Moorland uniformly throughout Tierra del Fuego and southern Patagonia. At latitude 41°S the lateglacial pollen assemblages are dominated by rainforest types west of the Andes, suggesting cold and wet conditions, while east of the Andes grasses and herb pollen dominated the assemblages, suggesting conditions colder a...

Morphological development of resting cysts in cultures of the marine dinoflagellate Lingulodinium polyedrum (= L. Machaerophorum)

Abstract: The previously undescribed morphological development of resting cysts of the living marine dinoflagellate Lingulodinium ("Gonyaulax") polyedrum has been observed in laboratory cultures. Referred to as L. machaerophorum in cyst‐based taxonomy, this species has a fossil record extending back at least to the Early Eocene. In our cultures, planozygotes preparing to encyst showed a distinctive interstice in the peripheral cytoplasm and often displayed a characteristic swimming behavior. The transition from motile planozygote to morphologically mature hypnozygote (resting cyst) took approximately 10–20 minutes. Encystment began with several events occurring simultaneously: (1) the cell stopped swimming and came to rest at the bottom of the observation chamber, (2) flagella were expelled from their respective thecal grooves, (3) localized swelling of a membrane external to the theca formed bubble‐like protrusions on the surface of the cell, (4) the theca began to dissociate along one or more plate sutur...

Palynostratigraphy of upper paleozoic sequences in central–western argentina

Abstract: Lower Carboniferous to Permian palynological zones are described from sections in central–western Argentina. In ascending stratigraphic order these zones are: (1) the Cordylosporites– Verrucosisporites (CV) Assemblage Biozone (spanning the Maliman and Cortaderas formations); (2) the Raistrickia densa– Convolutispora muriornata (DM) Assemblage Biozone (which is subdivided into: Sub-biozone A in the Guandacol and equivalent formations, Sub-biozone B in the Tupe Formation and equivalents, and Sub-biozone C in the upper part of the Santa Maxima and El Imperial formations); (3) the Fusacolpites fusus–Vittatina subsaccata (FS) Interval Biozone in the Bajo de Veliz and Tasa Cuna formations and equivalents, and (4) the Lueckisporites– Weylandites (LW) Assemblage Biozone in the De La Cuesta and Yacimiento Los Reyunos formations. The oldest biozone (CV) is assigned to the Early Carboniferous and the overlying DM Biozone to the Late Carboniferous. The uppermost FS and LW biozones are Permian in age. Palynological records show the impact of the Early-to-Late Carboniferous glacial event, which caused significant changes in the composition of the assemblages from this interval. Further studies are necessary to calibrate a regional geological time scale in Gondwana, which is essential for precise correlation.

A Palynological Zonation for the Cenozoic of the Llanos and Llanos Foothills of Colombia

Abstract: Hydrocarbon exploration in the Llanos Foothills of Colombia has intensified during the past several decades. Exploration in this region is problematic owing to structural complexities, rapid lateral facies changes, and the difficulties of acquiring good seismic imaging. These elements increase the uncertainties about the prognosis and subsequent drilling of exploratory wells. Under these conditions, biostratigraphy can play a significant role in the exploratory process. In the Llanos Foothills, palynology is the most useful biostratigraphic tool because pollen is the most abundant fossil group. In this study we analyze pollen information from 70 sections (624,744 palynomorph grains from 6707 samples) to construct a biostratigraphic zonation for the Llanos Foothills and Llanos basins. Using both graphic correlation and constrained optimization in our analysis, we propose 18 palynological zones for the Cenozoic of the Llanos and Llanos Foothills. These zones are tied to the geological timescale using 18 calibration points that include carbon isotopes, foraminifera, and magnetostratigraphy.