{"id":40013,"date":"2023-03-09T05:59:52","date_gmt":"2023-03-08T20:59:52","guid":{"rendered":"http:\/\/kochihen.replan.ne.jp\/?p=40013"},"modified":"2023-03-10T09:27:05","modified_gmt":"2023-03-10T00:27:05","slug":"%e3%80%90%e5%8c%97%e6%b5%b7%e9%81%93%e3%81%ae%e3%80%8c%e8%b2%9d%e9%a1%9e%e3%80%8d8020%e4%b8%87%e5%b9%b4%e3%81%ae%e5%8c%96%e5%ad%a6%e5%b1%a4%e5%ba%8f%e3%80%91","status":"publish","type":"post","link":"https:\/\/kochihen.replan.ne.jp\/?p=40013","title":{"rendered":"\u3010\u5317\u6d77\u9053\u306e\u300c\u8c9d\u985e\u300d8020\u4e07\u5e74\u306e\u5316\u5b66\u5c64\u5e8f\u3011"},"content":{"rendered":"

\"\"<\/a>
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\n\"\"<\/a>
\n\"\"<\/a>
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English version\u2b07<\/p>\n

Chemostratigraphy of Hokkaido’s “Shellfish” 80.2 Million Years Ago
\nWhile studying the latest research in geology, I encountered fossils of ancestors of Hokkaido shellfish. The history of the earth’s shellfish, which is made clear by the texture of sashimi. …<\/p>\n

At the end of last year, I visited the “Chemistry Stratigraphy” exhibition at the Science Museum in Ueno, Tokyo. As a history buff, I am interested in geological stratigraphy and geochronology, and I know that NHK’s “Bratamori” also uses it as a basis for its program structure. The basic information of geology is the concept of “stratigraphy,” which is the layering of strata. The higher the stratigraphy, the newer it is, indicating differences in thickness, sedimentary structure, and types of rocks and fossils in each layer. Such a concept is called “chemostratigraphy.
\nThis reminds me of my high school days when I was extremely ill-prepared. There was an achievement test that I could not prepare for, and I chose “geology,” and to my surprise, I was ranked in the top of my class. It was the only “success experience” in my personal study history (laughs). Thinking about it in reverse, I wonder if since then I have been interested in the presentation of the results of the latest research like this because I think geology is interesting.
\nLearning at such maniacal exhibitions gives me a sense of a compass for where we are going and where we are going to go. Human history is also strongly influenced by such a macroscopic span of time. As I was studying the exhibition, the word “Hokkaido” suddenly appeared in front of my eyes, and I was awakened unexpectedly.<\/p>\n

Amapondera amapondense, a type of “ammonite” that is considered a “shellfish” species, is found only in Hokkaido on earth at the latest age confirmed by fossils, about 80.2 million years ago.
\nIt is said that this fossil came to the Science Museum here in Tokyo on a business trip from the Hobetsu Museum in Mukawa-cho, Hokkaido, and that information on this species is not easy to find even when searching on the Web.
\nAmmonites, on the other hand, are a taxon of cephalopods that flourished and were widely distributed in the oceans from the late Silurian of the Paleozoic Era to the end of the Cretaceous of the Mesozoic Era, a period of about 350 million years. Many species are characterized by their flattened shells, which are shaped like a spiral shell. The species is strongly related to shellfish.
\nI have been deeply indebted to Hokkaido’s seafood, and am fascinated by the taste of hokki-gai clams, such as the one in the second photo, and eat them as sashimi almost on a daily basis. I feel as if these distant ancestors suddenly descended upon me at an unexpected moment. Humans have sinfully survived by eating other species. To eat is to kill a living thing, but at the same time, I feel that it is a symbiosis of life. Reincarnation. The reincarnation of life.<\/p>\n","protected":false},"excerpt":{"rendered":"

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