Ethyl cellulose (EC) is a thermoplastic nonionic cellulose ether, soluble in various organic solvents, at low temperatures can still retaining the with adhesive, filling and film good flexibility.

They were formed through regional isostatic adjustment and Theological flexure under the load of fold-thrust belts.

The development and evolution of the slope-breaks are episodic and successive: in early period, it is faulted slope-break; in later period, it is flexural slope-break.