Is Oracle Bone Inscriptions a tortoise shell or a tortoise shell?

Oracle Bone Inscriptions is mainly carved from the belly bones of turtles.

Oracle Bone Inscriptions is an ancient script in China, an early form of Chinese characters, sometimes regarded as a kind of Chinese characters, and also the oldest mature script in Chinese dynasties.

Oracle Bone Inscriptions, also known as "Wen Qi", "Oracle Bone Inscriptions", Yin Ruins or "tortoise shell and animal bones". Oracle Bone Inscriptions recorded and reflected the political and economic situation of Shang Dynasty, which mainly refers to the words carved on tortoise shells or animal bones by the royal family in China in the late Shang Dynasty (14 ~ 1 1 century), and their contents are generally the things asked or the results obtained by divination. After the demise of the Shang Dynasty and the rise of the Zhou Dynasty, Oracle Bone Inscriptions still used it for a period of time, which is an important material for studying the social history of the Shang and Zhou Dynasties. Oracle Bone Inscriptions's form and structure have tended to be combined independently, and a large number of pictophonetic characters have appeared, which is already a quite mature writing form and the earliest systematic writing form known in China. It inherits the original carving symbols, enlightens the bronze inscriptions, and is the key form of the development of Chinese characters, which is called "the earliest Chinese characters". Modern Chinese characters evolved from Oracle Bone Inscriptions.