Chronostratigraphy and geochronology: a proposed realignment [PDF]
, 2013 We propose a realignment of the terms geochronology and chronostratigraphy that brings them broadly into line with current use, while simultaneously resolving the debate over whether the Geological Time Scale should have a “single” or “dual” hierarchy of
Cita, Maria Bianca +6 more
core +1 more source
Palaeontology, Volume 67, Issue 2, March/April 2024.Abstract Strophomenoid brachiopods had thin, concavo‐convex shells, were ubiquitous colonizers of Palaeozoic muddy seafloors, and are hypothesized to have filter‐fed in a concave‐upward orientation. This orientation would elevate their line of commissure out of potentially lethal lophophore‐clogging mud.
Benjamin F. Dattilo +7 more
wiley +1 more source
Alleged cnidarian Sphenothallus in the Late Ordovician of Baltica, its mineral composition and microstructure [PDF]
Acta Palaeontologica Polonica, 2015 Sphenothallus is a problematic fossil with possible cnidarian affinities. Two species of Sphenothallus, S. aff. longissimus and S. kukersianus, occur in the normal marine sediments of the Late Ordovician of Estonia. S.
Olev Vinn, Kalle Kirsimäe
doaj +1 more source
Papers in Palaeontology, Volume 10, Issue 1, January/February 2024.Abstract An unusually rich and diverse suite of virgianid brachiopods, hitherto poorly known, is systematically described here for the first time from the Ordovician–Silurian boundary interval (late Katian – Aeronian) of North Greenland. The Late Ordovician virgianids comprise typical taxa of the warm‐water Tcherskidium fauna (e.g.
Jisuo Jin +3 more
wiley +1 more source
Kajian Pemanfaatan Lemak Fleshing Industri Penyamakan Kulit [PDF]
, 2011 The process of fleshing in the leather tannery generates solid waste in theform of pieces of meat mixed with fat. Fleshing wastes contain approximately 50-80 o% protein and 20-40 % fat.
Sutyasmi, S. (Sri)
core +3 more sources
Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China
Geochemistry, Geophysics, Geosystems, Volume 25, Issue 1, January 2024.Abstract The Hirnantian period, making the end of the Ordovician with significant mass extinctions and large ice‐sheets, is a critical interval for studying paleoclimate variations. This research represents the first cyclostratigraphic study of this period, utilizing high‐resolution (1 mm sampling rate) geochemical data from the ∼7‐m thick SH‐1 drill ...
Siding Jin +5 more
wiley +1 more source
The rise of pinnacle reefs : a step change in marine evolution triggered by perturbation of the global carbon cycle [PDF]
, 2019 The first appearance of pinnacle reef tracts, composed of hundreds to thousands of localized biogenic structures protruding tens to hundreds of meters above the surrounding mid-Silurian seafloor, represents a step change in the evolution of the marine ...
Bancroft, Alyssa M +5 more
core +1 more source
A swollen crinoid pluricolumnal from the Upper Ordovician of northern Kentucky, USA: the oldest record of an amorphous paleopathologic response in Crinoidea? [PDF]
Estonian Journal of Earth Sciences, 2014 Swollen or otherwise malformed crinoid remains are relatively common in the Phanerozoic. However, published reports typically describe swellings associated with a discrete pit, boring, embedment structure or encruster, and, moreover, are overwhelmingly ...
James R. Thomka +2 more
doaj +1 more source
Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane [PDF]
, 2015 The Precordillera terrane in northwestern Argentina is interpreted to be anexotic (Laurentian) continental fragment that was accreted to western Gondwanaduring the Ordovician. One prominent manifestation of the subductionand collision process is a Middle?
Astini, Ricardo Alfredo +3 more
core +1 more source
Stars in the Silurian sky : Echinoderm holdfasts from the Carnic Alps, Austria [PDF]
, 2014 A small collection of echinoderm holdfasts from the Ludlow Cardiola Formation of the Carnic Alps (Austria) contains a wide range of morphologies as a response of environmental adaptation.
Ausich, W. I. +4 more
core +5 more sources