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Abstract ▼ AI-Helper

The middle Cambrian Daegi Formation is predominantly composed of white to light gray massive to thin-bedded limestone, and oolitic and dolomitic limestone. The formation is generally known to have deposited in a shallow-marine setting. However, some studies suggested that the Daegi formation was dep...

The middle Cambrian Daegi Formation is predominantly composed of white to light gray massive to thin-bedded limestone, and oolitic and dolomitic limestone. The formation is generally known to have deposited in a shallow-marine setting. However, some studies suggested that the Daegi formation was deposited in a front-reef or back-reef slope environment, based on the presence of the breccias in the upper part of the formation near the Dongjeom area. Digesting the breccias with hydrochloric acid, five trilobite species were recovered: i.e., Pseudagnostus sp., Jiulongshania regularis, Bergeronites sp., dameseliid gen. et sp. indet. 1, and dameseliid gen. et sp. indet. 2. The faunal assemblage shows a close affinity to the fauna from the Stephanocare Zone of the Sesong Formation, while it is markedly different from the recently reported fauna of the upper part of the Daegi Formation. This result is inconsistent with the interpretation that the Daegi Formation was deposited in a front-reef or back-reef slope environment, and indicates that the breccias within the Daegi Formation were derived from the overlying Sesong Formation by the fault movements in the area.

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