[dinosaur] Dinosaur track-bearing deposits in Sagok Formation of Korea (free pdf)

Ben Creisler
[email protected]

A recent paper not yet mentioned:

Free pdf:

Hyun Joo Kim, Koo Geun Hwang, Ho Hyun Jeong, Ho Yong Ahn, Chul Uong Choi,
Hyoun Soo Lim, Taejin Choi, Yong-Un Chae & In Sung Paik (2019)
Dinosaur track-bearing deposits in Sagok Formation (Cretaceous) at
Sinseong-ri, Cheonsong-gun, Korea: Occurrences and paleoenvironments.
Journal of the Geological Society of Korea  55(5): 495-511 (in Korean)
DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.14770_jgsk.2019.55.5.495&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=69dGc8OFMLlrpifkaGvm8uS-FzfbCFwSJ9pjUb2GzZ8&s=oKJf8CTA9Y-URIsDMd6Ir4r_A_mIkTNgyyY8WNq6-kg&e= 
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Abundant sauropod, theropod and ornithopod dinosaur trackways and several
footprint fossils occur in the Sagok Formation (Cretaceous) at Sinseong-ri,
Cheongsong-gun, Korea. Based on Ortho Mosaic Image calibrated by UAV
(Unmanned Aerial Vehicle), and 3D image map obtained by LiDAR (Light
Detection and Ranging) and digital geometry, distribution of the trackways
was identified. Occurrences of dinosaur tracks and sedimentary facies of
the track-bearing deposits were described and the paleoenvironments were
interpreted. The sauropod and ornithopod trackways represent their
gregarious behavior. The theropod trackways show the characteristic of
solitary behavior, whereas small theropod trackways discovered newly in
this study show their gregarious behavior. The sedimentary facies of the
track-bearing deposits are divided as follows: Interlaminated to thinly
interbedded fine-grained sandstone to siltstone and mudstone; Bluish gray
to light green calcareous sandy to silty mudstone; Light greenish gray
muddy sandstone to sandy mudstone; Planar- to cross-laminated fine-grained
sandstone to siltstone; Thin- to medium-bedded and graded medium- to
fine-grained sandstone. They are interpreted as unconfined flow deposits
formed on lake margin to shallow lake under paleoclimatic conditions with
alternating wetting and drying intervals, and to have been intermittently
influenced by pedogenesis. Mudcracks, wave ripples, small invertebrate
trace fossils, weak pedogenesis and evaporite mineral casts are observed in
the track-bearing deposits, suggesting that the paleoenvironments of the
Sagok Formation at Sinseong-ri were lake margin (mudflat to sandflat) to
shallow lake under seasonal climate in which arid climate prevailed and the
lake was sometimes brackish during drying periods. It is interpreted that
the Cretaceous lake and lake margin at Sinseong-ri provided a ecosite for
diverse dinosaurs during arid condition.