"Water and land" complete!The three major "treasures of the town hall" of the Chengdu Natural Museum to watch the first

Recently, Chengdu Natural Museum, which has received much attention, passed the completion acceptance. On July 11, the "Tianfu Tourism County Tour" activity organized by the Sichuan Provincial Department of Culture Traversing on the Department of Literature and Travel entered the Chengdu Natural Museum in Chengdu, Chengdu, Chengdu. The interpreter introduced the three "treasures of the town hall" of the museum -the Longchang Iron meteorite on the first floor, the Marson Xilong on the second floor, and the big bamboo Chongqing fish on the third floor. Interestingly, these three babies come from "water and land".

▲ Dinosaur skull specimen

Empty -Longchang iron meteorite from the sky

The Longchang Iron meteorite fell to Dao Guanping, about Wuhua Lili, northwest of Longchang County, Sichuan Province. It was deeply entered. In the 25th year of the Qianlong of the Qing Dynasty (AD 1761), it was excavated with "God". The annual transportation returns to the Chengdu Natural Museum.

▲ Longchang iron meteorite

The appearance of the meteorite is conical, cone height 46 cm, 44 cm long, and 20 cm wide. The internal students must be composed of two cosmic mineral minerals: tapered stone and nickel -grained stone. The total iron nickel content is 98.59%, and it contains a small amount of CO and CR. The top of the surface is smooth, and the middle and back parts are covered with concave pits, proving that it has suffered from the long -term erosion of the Chenchen before falling. During the ground falling process, the magneticity is strong and the polarity.

Longchang Iron meteorite is probably the size of an adult, and it doesn't look difficult to hold it, but the actual weight is 158.5 kg, and the proportion is 7.572, which is equivalent to holding two adult men with 7 or eight kg.

Lu -22 meters of "Big" Hechuan Marsen Xilong

The biggest feature of the Menxi Dragon on the second floor is "big". It is the largest lizard dinosaur currently discovered in China. This is 22 meters long and nearly 4 meters high. Its neck is particularly long, which is equivalent to half of the length of the body. Not only does each neck spine grow in length, but also the number of cervical spine is as many as 19, which is the most one of the ham.

▲ Marson Dragon in Hechuan

In addition, its neck ribs are the longest of all dinosaurs, and the longest neck rib can reach 2.1 meters. The Marson stream dragon in the museum looks like a bridge hanging on both ends. Standing under it, you need to look up. According to the introduction of the interpreter, not only is it large that the amount of fossils of the specimen reached more than 80%.

Water -Dazhu Chongqing Fish 150 million years ago

The last one of the three "treasures of the town hall" is the big bamboo Chongqing fish from the third floor, from 150 million years ago. Dazhu Chongqing fish is a hard -bone fish outline, ancient cod, large individual, long spinning -shaped, dorsal fins in the middle of the back, cable fin is a semi -crooked tail -shaped fork deep and large, and the scales are thick and rhodole. This specimen is very complete. The geological age is the late Jurassic world, 150 million years ago; the place of origin is Dazhu County, Sichuan Province; the collection time is 1958. It has extremely high scientific research value and collection value.

▲ Daza Chongqing fish

Why can Dazhu Chongqing Fish be so complete? It is understood that after the death of the big fish, it was quickly buried by the sediment after death, thus complement the air, and the proper pressure also kept this big fish in a complete body, and wasolate the erosion of bacteria and other microorganisms. In hundreds of millions of years, long -term isolation from the air and has been affected by high temperature and high pressure. The sediment covered on the corpse of the fish has become thicker and thicker, forming a hard sedimentary rock. fossil.

▲ Daza Chongqing fish

Red Star Journalist Lin Cong Photography Reporter Wang Qin

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