The Holotype of Hyolithes baconi from the Ordovician Trenton Fm. in Rock County, WI. Hyolitha is a particularly enigmatic group, but was recently classified as a lophophorate, making it closely related to brachiopods. Type Collection

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古生代が揃ったのでまとめとく。

①An angel and a demon in Cambrian period(カンブリア紀)
②An angel and a demon in Ordovician period(オルドビス紀)
③An angel and a demon in Silurian period(シルル紀)

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New Upper Cambrian and Lower Ordovician conodont biostratigraphy and revised lithostratigraphy, Boothia Peninsula, Nunavut 👀 over 640 conodont specimens, with 35 species = 16 genera + a new species, Rossodus? boothiaensis sp. nov.
https://t.co/jQwDodzqJU

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ホプリタスピス
Hoplitaspis hiawathai

広い視野、細長い体と爪のある遊泳脚をもつオルドビス紀のChasmataspidida類。
An ordovician chasmataspidid with wide field of vision, narrow body and clawed swimming legs.

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Estimated at ~6m long, giant orthocone cephs in the Cameroceras genus were some of the largest in the late Ordovician/early Silurian!

Cameroceras ?sp

*Dates, colors, and exact morphology unknown

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Sacabambaspis janvieri is an extinct armoured fish that swam the oceans during the Ordovician period. They had no jaws & reached 25cm in length.

(Credit: deviantart/xiphactinus)

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Aphetoceras, a free-swimming, bottom-dwelling nautiloid from the Ordovician. The 1st artwork I ever shared to social media!

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Geochemistry of Late Ordovician dalmanelloid brachiopods from Laurentia: testing the effects of paleolatitudinal gradient

https://t.co/nyARgpQSfG

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Progress made on my series Deep Time Dramas! Working to combine and expression. Plenty more to go on these (including actually adding animals ofc)
1. The Devonian - love, connectivity
2. The Ordovician/Silurian Extinction - indecision, separation

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Cold on the way to work this morning? Consider yourself lucky that you didn't live during the most extreme ice age of the last 550 My, at the end of the Ordovician Period. About 50% of marine genera went extinct, and stocks in the refrigeration industry plummeted.

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If the Earth is 4.543 billion yrs old, aren't today's Millennials actually Ordovicians?

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Sunday: our January 2013 DD bulletin cover, the Late Ordovician rhombiferan "cystoid" *Lepadocystis moorei*

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Our very first bulletin cover art (Jan 2013):the Late Ordovician rhombiferan echinoderm *Lepadocystis moorei*

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Our March 2013 bulletin cover: a Late Ordovician oncocerid cephalopod eyes a tasty trilobite. In sepia tone!

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Our April 2013 bulletin cover: Late Ordovician (Katian; Richmondian) brachiopod *Eochonetes clarksvillensis*

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