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41. | dirty formation |
| 含泥质地层 |
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42. | geological formation |
| 地质层组|地质组成 |
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43. | group formation |
| 群体形成 |
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44. | laminar formation |
| 层状地层 |
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45. | index formation |
| 标准建造 |
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46. | ketal formation |
| 酮缩醇的形成 |
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47. | class formation |
| 类构造 |
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48. | lamella formation |
| 薄板形成 |
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49. | aggregate formation |
| 团集体形成 |
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50. | Lance Formation |
| 兰斯组 |
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