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Hemiaulus

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Series: GSA Memoirs
Published: 01 January 1988
DOI: 10.1130/MEM169-p55
..., Gladius antarcticus f. alta, Hemiaulus huberi, Hemiaulus seymouriensis, Pterotheca minor, Pterotheca trojana, and Wittia macellarii. The microfossil assemblages compare well with floras of similar age from diatomites in the Ural Mountain region of the Soviet Union and from Deep Sea Drilling Project...
Journal Article
Journal: Geology
Published: 01 January 2009
Geology (2009) 37 (1): 83-86.
.... Approximately 70 inclusions were assignable to the genera Basilicostephanus, Coscinodiscus, Hemiaulus, Melosira, Paralia, Skeletonema, Stephanopyxis, Trochosira, ?Aulacoseira, and to the order Rhizosoleniales. Some of them are represented by several species. This diatom assemblage is mainly composed of colonial...
FIGURES
Image
Marine diatoms preserved in late Albian French amber. A: Girdle view of Bas...
in > Geology
Published: 01 January 2009
Figure 1. Marine diatoms preserved in late Albian French amber. A: Girdle view of Basilicostephanus. B: Fragment of Coscinodiscus. C–G: Different girdle views of genus Hemiaulus. H: Chain of three Melosira. I: Long colony of Paralia. J: Isolated Rhizosoleniales. K: Colony of Skeletonema. L, M
Image
Scanning electron microscope (SEM) backscattered electron imagery (BSEI) ph...
in > Geology
Published: 01 August 2012
is also evident in low abundance: e.g., ebridians (Eb), silicoflagellates (Sf), and diatoms Anaulus arcticus (An), Goniothecium danicum (Go), Hemiaulus spp. (He), and Stephanopyxis spp. (St), among others. Gray areas are clay rich and larger bright nonbiogenic elements are silt- and sand-sized
Series: Geological Society, London, Special Publications
Published: 01 January 2004
DOI: 10.1144/GSL.SP.2004.230.01.14
EISBN: 9781862394780
... influx including Coscinodiscus sp. 1 {^Fenestrella antiqua) and Coscinodiscus sp. 2 {^Coscinodiscus morsianus var. moelleri). This influx occurs within a rich and diverse diatom association, including species of Triceratium, Isthmia, Hemiaulus and Trinacria . Mitlehner s (1996...
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Journal Article
Journal: Geology
Published: 01 August 2012
Geology (2012) 40 (8): 727-730.
... is also evident in low abundance: e.g., ebridians (Eb), silicoflagellates (Sf), and diatoms Anaulus arcticus (An), Goniothecium danicum (Go), Hemiaulus spp. (He), and Stephanopyxis spp. (St), among others. Gray areas are clay rich and larger bright nonbiogenic elements are silt- and sand-sized...
FIGURES
Journal Article
Journal: Geology
Published: 01 January 2012
Geology (2012) 40 (1): 15-18.
... is dominated by fragments and intact valves of three taxa: Stephanopyxis spp., Hemiaulus polymorphus , and Stellarima spp. In addition, concentrations of Azpeitiopsis morenoensis may occur along the base of diatomaceous laminae, and Chaetoceros -type resting spores may occur along the top ( Fig. 2...
FIGURES
Journal Article
Journal: Geology
Published: 01 November 2002
Geology (2002) 30 (11): 1043-1046.
... ). The boundary between the Hemiaulus sp. A zone and the Pterotheca reticulata partial range zone is defined by the LO of Lisitzinia ornata and occurs between samples at 256.92 and 259.20 mbsf within an interval of increased diatom abundances ( Fig. 2 ). L. ornata ranges from chron C9r to chron C6Cr...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 March 2017
GSA Bulletin (2017) 129 (3-4): 318-330.
... ; M. — Malvinia ; H. — Hemiaulus ; D. — Distephanosira . FO—First Occurrence; FCO—First Common Occurrence; LO—Last Occurrence; LCO—Last Common Occurrence. Seismic unit PS.2A1 was subdivided into three subunits by Erohina et al. (2004) . The lowermost unit PS.2A1-CT is laterally continuous...
Journal Article
Published: 01 January 2005
Rocky Mountain Geology (2005) 40 (1): 1-24.
... include Hemiaulus, Trinacria, Sheshukovia, and Stephanopyxis (e.g., Harwood, 1988 ; Fenner, 1994 ; Tapia and Harwood, 2002 ). Their absence in the Tongue River samples is attributed to a combination of lower-salinity depositional conditions and to post-burial, taphonomic dissolution of these small...
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Journal Article
Journal: Palynology
Published: 03 July 2017
Palynology (2017) 41 (3): 311-338.
... and North America (Gingerich 2003 ; Smith et al. 2006 ). Among planktonic protists, during the PETM few short-lived species of asymmetric discoasters and rhomboasters proliferated in the Atlantic and Tethys Oceans (Kahn & Aubry 2004 ). At the same time, the short-lived diatom species Hemiaulus...