Results 21 to 30 of about 21,253 (209)

Proterozoic and early Palaeozoic microfossils in the Karikkoselkä impact crater, central Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2001
The Karikkoselkä impact crater is located at Petäjävesi (Lat. 62°13.3' N, Long. 25°14.7' E), in central Finland. The crater is filled with impact-generated breccias and redeposited sedimentary rock yielding microfossils.
A. Uutela
doaj   +1 more source

Micropalaeontology reveals the source of building materials for a defensive earthwork (English Civil War?) at Wallingford Castle, Oxfordshire [PDF]

open access: yes, 2010
Microfossils recovered from sediment used to construct a putative English Civil War defensive bastion at Wallingford Castle, south Oxfordshire, provide a biostratigraphical age of Cretaceous (earliest Cenomanian) basal M. mantelli Biozone. The rock used
Christie, Neil   +6 more
core   +1 more source

Terraced Iron Formations: Biogeochemical Processes Contributing to Microbial Biomineralization and Microfossil Preservation

open access: yesGeosciences, 2018
Terraced iron formations (TIFs) are laminated structures that cover square meter-size areas on the surface of weathered bench faces and tailings piles at the Mount Morgan mine, which is a non-operational open pit mine located in Queensland, Australia ...
Jeremiah Shuster   +4 more
doaj   +1 more source

Palynomorphs of brackish and marine species in cores from the freshwater Lake Sapanca, NW Turkey [PDF]

open access: yes, 2010
Lake Sapanca, which is located on the Sakarya–Sapanca–İzmit corridor in NW Turkey, is a freshwater lake with numerous fish farms in its catchment. Palynological analyses including non-pollen palynomorphs of a short (38.5 cm) and a longer sediment core ...
Aksu   +49 more
core   +1 more source

Microfossil-like tourmaline microlites in early Proterozoic nodular chert at Kiihtelysvaara, eastern Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1992
Many Proterozoic silicified sedimentary carbonates have been reported to contain remains of early micro-organisms. One of these localities in the Fennoscandian Shield is the village of Hyypiä at Kiihtelysvaara in eastern Finland, where a nodular chert ...
J. Karhu, H. O'Brien
doaj   +1 more source

Advantages of doubly polished thin sections for the study of microfossils in volcanic rock

open access: yesGeochemical Transactions, 2006
Doubly polished thin sections, originally prepared for fluid inclusion studies, present great advantages in the study of microfossils in volcanic rocks.
Ivarsson M
doaj   +1 more source

Fossil biomass preserved as graphitic carbon in a late paleoproterozoic banded iron formation metamorphosed at more than 550°C [PDF]

open access: yes, 2019
Metamorphism is thought to destroy microfossils, partly through devolatilization and graphitization of biogenic organic matter. However, the extent to which there is a loss of molecular, elemental and isotope signatures from biomass during high ...
De Gregorio, BT   +9 more
core   +2 more sources

Alpine Glacier Reveals Ecosystem Impacts of Europe's Prosperity and Peril Over the Last Millennium

open access: yesGeophysical Research Letters, 2021
Information about past ecosystem dynamics and human activities is stored in the ice of Colle Gnifetti glacier in the Swiss Alps. Adverse climatic intervals incurred crop failures and famines and triggered reestablishment of forest vegetation but also ...
S. O. Brugger   +10 more
doaj   +1 more source

Bolboforma from Leg 105, Labrador Sea and Baffin Bay, and the chronostratigraphy of Bolboforma in the North Atlantic [PDF]

open access: yes, 1989
The genus Bolboforma, first described by Daniels and Spiegler (1974), is a problematic group of calcareous microfossils. Solbaforma is most probably a planktonic cyst (Rogl and Hochuli, 1976) having protozoan or algal affinities (Poag and Karowe, 1986 ...
Kaminski, M., Pallant, A.
core   +1 more source

Controls on development and diversity of Early Archean stromatolites [PDF]

open access: yes, 2009
The ≈3,450-million-year-old Strelley Pool Formation in Western Australia contains a reef-like assembly of laminated sedimentary accretion structures (stromatolites) that have macroscale characteristics suggestive of biological influence.
A. C. Allwood   +11 more
core   +3 more sources

Home - About - Disclaimer - Privacy