大興安嶺、海拉爾盆地群的含煤地層稱扎賚諾爾群，包括下部大磨拐組及上部伊敏組。大磨拐組可分為下段粗碎屑巖，中段砂泥巖和煤層，上段厚層泥巖、砂巖夾砂礫巖，在伊敏煤田含13～17個含煤組，煤層總厚達123m。伊敏組由細(xì)砂巖、粉砂巖、泥巖和煤層組成，主要在下段含煤，可采者4～6層組，總厚105m。扎賚諾爾群與二連一帶的巴彥花群以及哲里木盟一帶的霍林河群可以相當(dāng)。
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