scholarly journals First Deep-Sea Shark Fossil Teeth from the Miocene of South Korea

Zoodiversity ◽  
2021 ◽  
Vol 55 (3) ◽  
pp. 225-232
Author(s):  
Yun Chan-gyu
Keyword(s):  
South Korea ◽  
Deep Water ◽  
Deep Sea ◽  
Korean Peninsula ◽  
Middle Miocene ◽  
East Sea ◽  
Fossil Remains ◽  
Shark Teeth ◽  
Pohang Basin

Important vertebrate fossil remains were collected in the Pohang Basin in South Korea for many decades, but only few have been described up to now. Here, three deep-sea shark teeth are described, which most likely derived from the Duho Formation (middle Miocene) near Pohang City, South Korea. One of the teeth is identified as belonging to the genus Mitsukurina, while the others are assignable to Dalatias. None of these taxa were previously reported from the Korean Peninsula. The occurrences of these deep-water fishes in the Pohang Basin support the hypotheses that the Duho Formation was deposited in a deep-sea environment, and sharks, even including benthopelagic forms were already widely distributed throughout the East Sea when this sea was still developing.

scholarly journals A TOOTH OF THE EXTINCT LAMNID SHARK, COSMOPOLITODUS PLANUS COMB. NOV. (CHONDRICHTHYES: ELASMOBRANCHII) FROM THE MIOCENE OF POHANG CITY, SOUTH KOREA

2021 ◽  
pp. 9-16
Author(s):  
Chan-gyu Yun
Keyword(s):  
South Korea ◽  
Korean Peninsula ◽  
Type Species ◽  
Middle Miocene ◽  
Lateral Tooth ◽  
Young Individual ◽  
East Sea ◽  
Marine Deposits ◽  
Upper Jaw ◽  
Posterior Position

An isolated, upper lateral tooth of the extinct lamnid shark Cosmopolitodus planus (Agassiz, 1856), is described from middle Miocene marine deposits (possibly the Duho Formation) in Pohang City, South Korea. This is the first confirmed record of this taxon in the Korean Peninsula. The tooth is less than half the size of a large tooth of this species, suggesting that the tooth comes either from an intermediate or posterior position within the upper jaw, or from a young individual. This report further supports the hypothesis that epipelagic or pelagic sharks were already distributed throughout the entire East Sea in the middle Miocene. It is recommended that the species planus should be transferred to the genus Cosmopolitodus based on numerous similarities with the type species of this genus, C. hastalis (Agassiz, 1838).

scholarly journals New Example of Cosmopolitodus hastalis (Lamniformes, Lamnidae) from the Miocene of South Korea

Zoodiversity ◽  
2020 ◽  
Vol 54 (5) ◽  
pp. 433-438
Author(s):  
Yun Chan-gyu
Keyword(s):  
South Korea ◽  
Marine Sediments ◽  
Korean Peninsula ◽  
Fossil Record ◽  
Middle Miocene ◽  
East Sea

The author reports the discovery of an isolated juvenile tooth of an extinct lamnid shark Carcharodon hastalis from the Duho Formation, Pohang City, South Korea. This tooth is approximately 11 mm in height, suggesting a juvenile affinity of an individual this tooth originated. In life, the shark is estimated to have been approximately less than 2 m in length. This is the second reported fossil record of Carcharodon hastalis in the Korean Peninsula and the first permineralized fossil remain as well. Although largely undescribed, fossil shark assemblage of the Duho Formation is similar to those of contemporaneous Japanese marine sediments, indicating epipelagic or pelagic sharks were already diversified throughout the East sea during the Middle Miocene.

South Korea’s Claim to Dokdo

2017 ◽  
Vol 5 (2) ◽  
pp. 175-195
Author(s):  
Hee Eun Lee
Keyword(s):  
South Korea ◽  
20Th Century ◽  
Sea Of Japan ◽  
Korean Peninsula ◽  
East Sea ◽  
Early 20Th Century ◽  
Historical Records ◽  
Historical Injustice ◽  
Japanese Imperialism ◽  
Terra Nullius

Abstract Dokdo are tiny islets located in the East Sea (Sea of Japan) that have been the source of a longstanding conflict between Korea and Japan. Japan argues that the islets, referred to as Takeshima by Japan, were terra nullius when it incorporated them in 1905 during the Russo-Japanese War. However, South Korea claims that previous Korean kingdoms had sovereignty over the islets as evidenced through numerous historical records and maps. South Korea asserts original title over Dokdo noting that Japan’s incorporation of the islets and eventual annexation of the entire Korean peninsula was illegal. This article summarizes the major points South Korea has publicly raised in asserting its claim to Dokdo noting that South Korea’s claim to Dokdo is framed from the perspective of the historical injustice of Japanese imperialism and that Dokdo was the first Korean territory taken by Japan in its expansion into Asia in the early 20th century.

scholarly journals India's Developing Relationship with South Korea: A Useful Friend in East Asia

Asian Survey ◽  
2010 ◽  
Vol 50 (2) ◽  
pp. 402-425 ◽  
Author(s):  
David Brewster
Keyword(s):  
South Korea ◽  
East Asia ◽  
South Asia ◽  
Korean Peninsula ◽  
Balance Of Power ◽  
Economic Partnership ◽  
Security Relationship

The long-standing strategic disconnect between South Asia and the Korean Peninsula is breaking down. Driven by the changing balance of power in Asia, India and South Korea have developed a strong economic partnership, and taken small but significant steps toward a political and security relationship that refects their numerous shared strategic interests. This article explores the contours of this evolving relationship.

The Reproductive Biology of Ophiacantha Bidentata (Echinodermata: Ophiuroidea) From The Rockall Trough

1982 ◽  
Vol 62 (1) ◽  
pp. 45-55 ◽  
Author(s):  
P. A. Tyler ◽  
J. D. Gage
Keyword(s):  
Reproductive Biology ◽  
Deep Water ◽  
Larval Stage ◽  
North Pacific ◽  
Deep Sea ◽  
Direct Development ◽  
The Arctic ◽  
Shallow Waters ◽  
Arctic Seas ◽  
Rockall Trough

INTRODUCTIONOphiacantha bidentata (Retzius) is a widespread arctic-boreal ophiuroid with a circumpolar distribution in the shallow waters of the Arctic seas and penetrating into the deep sea of the.North Atlantic and North Pacific (Mortensen, 1927, 1933a; D'yakonov, 1954). Early observations of this species were confined to defining zoogeo-graphical and taxonomic criteria including the separation of deep water specimens as the variety fraterna (Farran, 1912; Grieg, 1921; Mortensen, 1933a). Mortensen (1910) and Thorson (1936, pp. 18–26) noted the large eggs (o.8 mm diameter) in specimens from Greenland and Thorson (1936) proposed that this species had ‘big eggs rich in yolk, shed directly into the sea. Much reduced larval stage or direct development’. This evidence is supported by observations of O. bidentata from the White and Barents Seas (Semenova, Mileikovsky & Nesis, 1964; Kaufman, 1974)..

Study on the Characteristics of Well Completion Technology in Deepwater Oil and Gas Field Development

2021 ◽  
Vol 3 (8) ◽  
pp. 70-72
Author(s):  
Jianbo Hu ◽  
◽  
Yifeng Di ◽  
Qisheng Tang ◽  
Ren Wen ◽  
...  
Keyword(s):  
Deep Water ◽  
Deep Sea ◽  
Oil And Gas ◽  
Gas Field ◽  
Marine Research ◽  
Field Development ◽  
Research Technology ◽  
Well Completion ◽  
Development Capacity ◽  
Exploration And Development

In recent years, China has made certain achievements in shallow sea petroleum geological exploration and development, but the exploration of deep water areas is still in the initial stage, and the water depth in the South China Sea is generally 500 to 2000 meters, which is a deep water operation area. Although China has made some progress in the field of deep-water development of petroleum technology research, but compared with the international advanced countries in marine science and technology, there is a large gap, in the international competition is at a disadvantage, marine research technology and equipment is relatively backward, deep-sea resources exploration and development capacity is insufficient, high-end technology to foreign dependence. In order to better develop China's deep-sea oil and gas resources, it is necessary to strengthen the development of drilling and completion technology in the oil industry drilling engineering. This paper briefly describes the research overview, technical difficulties, design principles and main contents of the completion technology in deepwater drilling and completion engineering. It is expected to have some significance for the development of deepwater oil and gas fields in China.

Nonmarine ostracods (Crustacea) from South Korea, including a description of a new species of Tanycypris Triebel (Cyprididae, Cypricercinae)

Zootaxa ◽  
2012 ◽  
Vol 3161 (1) ◽  
pp. 1 ◽  
Author(s):  
CHEON YOUNG CHANG ◽  
JIMIN LEE ◽  
ROBIN J. SMITH
Keyword(s):  
New Species ◽  
South Korea ◽  
Small Proportion ◽  
Korean Peninsula ◽  
New Records ◽  
Actual Number ◽  
Additional Species ◽  
Number Of Species ◽  
Freshwater Habitats ◽  
A New Species

Preliminary surveys of brackish and freshwater habitats in the southeast and east of South Korea produced a total of fifteenspecies. Ten of these species are new records for Korea, and one additional species, belonging to the genus Tanycypris, isnewly described herein. Twenty-seven species of nonmarine ostracods are now reported from Korea, but this is probablyonly a small proportion of the actual number of species inhabiting the peninsula. The presence of Dolerocypris ikeyaiSmith & Kamiya, 2006, Cryptocandona brehmi (Klie, 1934), Cryptocandona tsukagoshii Smith, 2011, Physocypria nip-ponica Okubo, 1990 and Vestalenula cylindrica (Straub, 1952) on the Korean Peninsula demonstrates that these species are also distributed on the continent, and are not endemic to Japan.

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