Gazelle : The Palestinian Biological Bulletin (ISSN 0178 – 6288) . Number 120, December 2014, pp. 1-29. | Page 10

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Amphicoelias
Amphicoelias (/ˌæmfɨˈsiːliəs/, meaning "biconcave", from the Greek αμφι, amphi:
"on both sides", and κοιλος, koilos: "hollow, concave") is a genus of
herbivorous sauropod dinosaur that includes what may be the largest
dinosaur ever discovered, Amphicoelias fragillimus. Based on surviving
descriptions of a single fossil bone, Amphicoelias fragillimus may have been the
longest known vertebrate at 40 to 60 metres (130 to 200 feet) in length, and may
have had a mass of up to 122 tonnes (135 short tons). However, because the only
fossil remains were lost at some point after being studied and described in the
1870s, evidence survives only in drawings and field notes. The fossil was found
in the Morrison Formation which is a distinctive sequence of Upper
Jurassic sedimentary rock that is found in the western United States of America,
and it has been the most fertile source of dinosaur fossils in North America. It is
composed of mudstone, sandstone, siltstone and limestone and is light grey,
greenish gray, or red. Most of the fossils occur in the green siltstone beds and
lower sandstones, relics of the rivers and floodplains of the Jurassic period
(Wikipedia).

The skeleton of the Long-necked Whip-tailed Sauropod Dinosaur (Amphicoelias
brontodiplodocus Galiano and Albersdörfer, 2010) at Dubai Mall, Dubai, UAE.
Photo by Prof. Dr. Sc. Norman Ali Bassam Khalaf-von Jaffa. 08.04.2014.
https://www.flickr.com/photos/50022881@N00/13890085613/
Gazelle : The Palestinian Biological Bulletin – Number 120 – December 2014