Hirokazu Yukawa

Insect-Bearing Horizon of the Upper Cretaceous Omichidani Formation (Katsuyama, Fukui, Japan): A Short Report

Nozomu Oyama, Hirokazu Yukawa, Takuya Imai, Yoichi Azuma

International audience

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A New Sinamiin Fish (Actinopterygii) from the Early Cretaceous of Thailand: Implications on the Evolutionary History of the Amiid Lineage

Uthumporn Deesri, Wilailuck Naksri, Pratueng Jintasakul, Yoshikazu Noda et autres

The Sinamiidae are a family of halecomorph fishes (Holostei) stratigraphically limited to the Lower Cretaceous and confined to East Asia. The first species of sinamiids were discovered in China, and then new occurrences were recorded in Thailand and Japan. The three recognized …

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U‑Pb-zircon ages for a tuff from the Nariwa Group (Honshu, SW Japan): a Jurassic age for the younger part of “Triassic” Nariwa Group and flora

Ulrich Knittel, Hirokazu Yukawa, Monika Walia, Shigeyuki Suzuki

Oldest leaf mine trace fossil from East Asia provides insight into ancient nutritional flow in a plant–herbivore interaction

Yume Imada, Nozomu Oyama, Kenji Shinoda, Humio Takahashi et autres

The Late Triassic saw a flourish of plant-arthropod interactions. By the Late Triassic, insects had developed all distinct strategies of herbivory, notably including some of the earliest occurrences of leaf-mining. Herein we describe exceptionally well-preserved leaf-mine trace fossils on a Cladophlebis Brongniart …

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Oldest Leaf-Mine Trace Fossil from East Asia and Stoichiometric Footprint: Insight Into Ancient Nutritional Flow in a Plant–Herbivore Interaction

Yume Imada, Nozomu Oyama, Kenji Shinoda, Fumio Takahashi et autres

Abstract The Late Triassic saw a flourish of plant–arthropod interactions. By the Late Triassic, insects had developed all distinct strategies of herbivory, notably including some of the earliest occurrences of leaf-mining. Herein we describe exceptionally well-preserved leaf-mine trace fossils on a Cladophlebis …

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New cockroach assemblage from the Lower Cretaceous Kitadani Formation, Fukui, Japan

Nozomu Oyama, Hirokazu Yukawa, Takuya Imai

日本産中生代昆虫化石 : とくに上部三畳系美祢層群産昆虫化石の位置づけについて

Nozomu Oyama, Hirokazu Yukawa, Haruyoshi Maeda

This paper reviews occurrence of the Mesozoic insect fossils from Japan. There are twenty insect fossil localities in Japan. Among them, the U pper Triassic Momonoki Formation, Mine Group in Yamaguchi Pref. is the oldest fossil insect bearing formation in Japan, and …

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New Early Cretaceous dinosaurian eggshell Multifissoolithus shimonosekiensis (Dinosauria, Dongyangoolithidae) from the Lower Cretaceous of Shimonoseki, Yamaguchi, Southwestern Japan

Takuya Imai, Yoichi Azuma, Hirokazu Yukawa

Dinosaur eggshells from Japan provide vital information about the relatively uncommon Early Cretaceous dinosaur eggs in Asia. Here, we describe a new Early Cretaceous dinosaur eggshell, Multifissoolithus shimonosekiensis from Shimonoseki, Yamaguchi, southwestern Japan. The specimen was collected in 1965 from the Aptian-Albian …

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Sedimentary environment of dinosaur fossil bearing successions of the Lower Cretaceous Kitadani Formation, Tetori group, Katsuyama city, Fukui, Japan

Shigeyuki Suzuki, Masateru Shibata, Yoichi Azuma, Hirokazu Yukawa et autres

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Facies analysis of Triassic Jito Formation, Okayama, Japan - a transgression event of late Triassic-

Shigeyuki Suzuki, Ryouta Nakamura, Hirokazu Yukawa

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上部三畳系成羽層群における 日本最古の化石林の発見 ―堆積環境復元および古植生復元における意義―

Hirokazu Yukawa, Kazuo Terada, Ge Sun, Shigeyuki Suzuki

Erect fossil stumps were found from the outcrop of the Upper Triassic Hinabata Formation, the uppermost part of the Nariwa Group at Hinabata, Nariwa-cho,Takahashi City, Okayama Prefecture, SW Japan. They are evidence of the oldest fossil forest in Japan. The Upper Triassic …

600 Reconstruction of paleovegetation using analysis of plant fossils and sedimentary facies of the Hinabata Fomation, the uppermost part of Triassic Nariwa Group, Southwest Japan

Hirokazu Yukawa, Ge Sun, Shigeyuki Suzuki