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| Sample no. | Macroscopic observation | Mineral composition | Structure construction | Name |
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| 1 | The rock is in gray-white color, with a fine crystalline texture and massive structure. It bubbles slightly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals. | Dolomite: 97%; calcite: 2%; others: 1% | Fine crystalline texture, massive structure | Fine-grained dolomite |
| 2 | The rock is in dark black color, with a powder crystalline texture and massive structure. The rock is so hard that a knife cannot strike on it. The rock is in dark black, but it does not pollute the hands. It bubbles strongly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals, carbonaceous matter, and siliceous matter. | Calcite: 85%; carbonaceous matter: 8%; siliceous matter: 7% | Powder crystalline texture, massive structure | Carbonaceous siliceous limestone |
| 3 | The rock is in gray-white color, with a fine crystalline texture and massive structure. It bubbles slightly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals. | Dolomite: 98%; calcite: 2% | Fine crystalline texture, massive structure | Fine-grained dolomite |
| 4 | The rock is in gray color, with an argillaceous texture and massive structure. The knife can strike on it. The rock powder has a slippery feeling. It is mainly composed of mud. It is in lamina and lamellation configuration. The minerals have a slightly oriented arrangement, but not obvious. A thin layer of pyrite is found in the hand specimen, which is granular aggregates and concentratedly distributed locally. | Dolomite: 98%; calcite: 2%. | Argillaceous texture, massive structure | Pyrite-bearing and sand-bearing mudstone |
| 5 | The rock is in gray color, with a powder crystalline to mesocrystalline texture and massive structure. It bubbles strongly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals. It fragments in a later stage, with broken cracks in lattices interspersed. | Calcite: 98%; dolomite: 1%; others: 1% | Powder crystalline to mesocrystalline texture, massive structure | Mesocrystalline limestone |
| 6 | The rock is in gray-white color, with a fine crystalline texture and massive structure. It bubbles slightly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals. | Dolomite: 97%; calcite: 2%; others: 1% | Fine crystalline texture, massive structure | Fine-grained dolomite |
| 7 | The rock is in dark gray color, with a mesocrystalline texture and massive structure. It bubbles weakly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals. The rock is broken, with broken cracks interspersed. | Dolomite: 98%; calcite: 2% | Mesocrystalline texture, massive structure | Mesocrystalline dolomite |
| 8 | The rock is in black color, with a microcrystalline to powder crystalline texture and massive structure. It bubbles slightly when dropping cold diluted HCl solution. It is mainly composed of carbonate minerals and carbonaceous matter. | Dolomite: 40%; calcite: 55%; carbonaceous matter: 5% | Microcrystalline to powder crystalline texture, massive structure. | Carbonaceous dolomite |
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