Valmiki Ramayana Sundara Kanda Sarga 56 Shloka 26

तदा then, तेन कपिना by that vanara, पीडितः pressed, सः पर्वतोत्तमः that great mountain, तैः those, भूतैः सह along with the creatures, वसुधातलम् to the earth, प्रविशन् while entering, कम्पमानैः with shaking, शिखरैः with peaks, पतद्भिः with dropped, द्रुमैः with trees, ररास crushed down making great sound.

Pressed under the feet of Hanuman, the great mountain made loud sound sinking into the earth along with all its creatures, with its shaken mountain peaks and uprooted trees dropping down.