Exhibit 1.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned persons hereby agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the common stock, par value $0.01 per share, of MONTAGE RESOURCES CORPORATION, and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filing. In evidence thereof each of the undersigned, being duly authorized, hereby execute this Agreement on the date set forth below.

Date:     March 1, 2019

EnCap Energy Capital Fund VIII, L.P.
By:	EnCap Equity Fund VIII GP, L.P.,
	its general partner
By:	EnCap Investments L.P.,
	its general partner
By:	EnCap Investments GP, L.L.C,
	its general partner
By:	/s/ Douglas E. Swanson, Jr.
Name:	Douglas E. Swanson, Jr.
Title:	Managing Director

EnCap Energy Capital Fund VIII Co-Investors, L.P.
By:	EnCap Equity Fund VIII GP, L.P.,
	its general partner
By:	EnCap Investments L.P.,
	its general partner
By:	EnCap Investments GP, L.L.C,
	its general partner
By:	/s/ Douglas E. Swanson, Jr.
Name:	Douglas E. Swanson, Jr.
Title:	Managing Director

EnCap Energy Capital Fund IX, L.P.
By:	EnCap Equity Fund IX GP, L.P.,
	its general partner
By:	EnCap Investments L.P.,
	its general partner
By:	EnCap Investments GP, L.L.C,
	its general partner
By:	/s/ Douglas E. Swanson, Jr.
Name:	Douglas E. Swanson, Jr.
Title:	Managing Director

EnCap Partners GP, LLC
By:	/s/ Douglas E. Swanson, Jr.
Name:	Douglas E. Swanson, Jr.
Title:	Managing Partner

TPR Residual Assets, LLC
By:	EnCap Energy Capital Fund IX, L.P.,
	its sole member
By:	EnCap Equity Fund IX GP, L.P.,
	its general partner
By:	EnCap Investments L.P.,
	its general partner
By:	EnCap Investments GP, L.L.C.,
	its general partner
By:	/s/ Douglas E. Swanson, Jr.
Name:	Douglas E. Swanson, Jr.
Title:	Managing Director