There used to be igneous intrusions into coal measures and overlying strata in the Hanxing coalfield.

邯邢煤田煤系及其上覆地层中常有岩浆岩侵入体穿插。

youdao

There used to be igneous intrusions into coal measures and overlying strata in the Hanxing coalfield.

邯邢煤田煤系及其上覆地层中常有岩浆岩侵入体穿插。

youdao