Exhibit 99.1

                            Joint Filers' Signatures

WARBURG PINCUS PRIVATE EQUITY (E&P) XI-A
(BRIGHAM), LLC

By: Warburg Pincus Private Equity (E&P) XI-A,
    L.P., its sole member
By: Warburg Pincus (E&P) XI, L.P., its general
    partner
By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS PRIVATE EQUITY (E&P) XI-A,
L.P.

By: Warburg Pincus (E&P) XI, L.P., its general
    partner
By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS XI (E&P) PARTNERS-A
(BRIGHAM), LLC

By: Warburg Pincus XI (E&P) Partners-A, L.P., its
    sole member
By: Warburg Pincus (E&P) XI, L.P., its general
    partner
By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS XI (E&P) PARTNERS-A, L.P.

By: Warburg Pincus (E&P) XI, L.P., its general
    partner
By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WP BRIGHAM HOLDINGS, L.P.

By: Warburg Pincus (E&P) XI, L.P., its general
    partner
By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory



WARBURG PINCUS (E&P) XI, L.P.

By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS PARTNERS (E&P) XI LLC

By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS (E&P) ENERGY LLC

By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS (E&P) ENERGY GP, L.P.

By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WP ENERGY BRIGHAM HOLDINGS, L.P.

By: Warburg Pincus (E&P) Energy GP, L.P., its general
    partner
By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: -------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WP ENERGY PARTNERS BRIGHAM HOLDINGS, L.P.

By: Warburg Pincus (E&P) Energy GP, L.P., its general
    partner
By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WARBURG PINCUS ENERGY (E&P)-A (BRIGHAM), LLC

By: Warburg Pincus Energy (E&P)-A, L.P., its managing
    member
By: Warburg Pincus (E&P) Energy GP, L.P., its general
    partner
By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WARBURG PINCUS ENERGY (E&P)-A, L.P.

By: Warburg Pincus (E&P) Energy GP, L.P., its general
    partner
By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WARBURG PINCUS ENERGY (E&P) PARTNERS-A
(BRIGHAM), LLC

By: Warburg Pincus Energy (E&P) Partners-A, L.P., its
    managing member
By: Warburg Pincus (E&P) Energy GP, L.P., its general
    partner
By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WARBURG PINCUS ENERGY (E&P) PARTNERS-A, L.P.

By: Warburg Pincus (E&P) Energy GP, L.P., its general
    partner
By: Warburg Pincus (E&P) Energy LLC, its general
    partner
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WARBURG PINCUS (E&P) XI LLC

By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its managing
    member
By: Warburg Pincus & Company US, LLC, its general
    partner


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


WARBURG PINCUS & COMPANY US, LLC


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


BRIGHAM PARENT HOLDINGS, L.P.

By: Warburg Pincus (E&P) XI, L.P., its general
    partner
By: Warburg Pincus (E&P) XI LLC, its general
    partner
By: Warburg Pincus Partners (E&P) XI LLC, its sole
    member
By: Warburg Pincus Partners II (US), L.P., its
    managing member
By: Warburg Pincus & Company US, LLC, its
    general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS PARTNERS II (US), L.P.

By: Warburg Pincus & Company US, LLC,
    its general partner


----------------------------------------  Date:--------------------------------
Name: Robert B. Knauss
Title: Authorized Signatory


WARBURG PINCUS LLC


By: ------------------------------------  Date:--------------------------------
    Name: Robert B. Knauss
    Title: Authorized Signatory


CHARLES R. KAYE


By: ------------------------------------  Date:--------------------------------
    Name: Charles R. Kaye
    By: Robert B. Knauss, Attorney-in-Fact*


JOSEPH P. LANDY


By: ------------------------------------  Date:--------------------------------
    Name: Joseph P. Landy
    By: Robert B. Knauss, Attorney-in-Fact*




____________________
* The Power of Attorney given by each of Mr. Kaye and Mr. Landy was previously
filed with the U.S. Securities and Exchange Commission on July 12, 2016 as an
exhibit to a beneficial ownership report on Schedule 13D filed by WP LLC with
respect to
WEX Inc. and is hereby incorporated by reference.