~~United~~UNITED ~~States~~STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

Current ~~Report~~ Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

~~The Securities~~Date ~~Act~~of report (Date of ~~1934~~earliest event reported): January 16, 2018

~~December~~Deltic ~~19,~~Timber ~~2017~~Corporation (Exact Name of Registrant as Specified in Its Charter)

~~Date~~Delaware (State or Other Jurisdiction of ~~Report~~ Incorporation or Organization) 1-12147 (~~date~~Commission ofFile ~~earliest~~Number) ~~event~~71-0795870 ~~reported~~(IRS Employer Identification No.)

~~Deltic Timber~~210 ~~Corporation~~East Elm Street, El Dorado, Arkansas (Address of Principal Executive Offices) 71730 (Zip Code)

(~~Exact name~~Registrant’s oftelephone ~~registrant~~number, asincluding ~~specified~~area incode: ~~its~~(870) ~~charter~~881-9400 Not Applicable (Former Name or Former Address, if Changed Since Last Report)

Delaware	1-12147	71-0795870
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

210 East Elm Street, El Dorado, Arkansas	71730
(Address of principal executive offices)	(Zip Code)

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

~~Registrant's~~o ~~telephone~~Soliciting ~~number,~~material ~~including area~~pursuant ~~code~~to Rule 14a-12 under the Exchange Act (~~870)~~17 ~~881~~CFR 240.14a-~~9400~~12)

o Pre-commencement communications pursuant to Rule 14d-2(~~Not~~b) ~~Applicable~~under the Exchange Act (17 CFR 240.14d-2(b))

~~(Former~~o ~~name~~Pre-commencement orcommunications ~~former~~pursuant ~~address,~~to ifRule ~~changed since~~13e-4(c) ~~last~~under ~~report~~the Exchange Act (17 CFR 240.13e-4(c))

~~Check~~Indicate ~~the~~by ~~appropriate~~check ~~box~~mark ~~below if~~whether the ~~Form~~registrant ~~8-K~~is ~~filing~~an isemerging growth ~~intended~~company toas ~~simultaneously~~defined ~~satisfy~~in Rule 405 of the ~~filing~~Securities ~~obligation~~Act of ~~the~~1933 ~~registrant~~(§230.405 ~~under~~of ~~any~~this chapter) or Rule 12b-2 of the ~~following~~Securities ~~provisions~~Exchange ~~(see~~Act ~~General~~of ~~Instruction~~1934 A(§240.12b-2~~.below~~ of this chapter):.

☐Emerging ~~Written~~growth ~~communications~~company ~~pursuant to Rule 425 under the Securities Act (17 CFR 230.425)~~o

☐If ~~Soliciting~~an ~~material~~emerging ~~pursuant~~growth tocompany, ~~Rule~~indicate ~~14a-~~by 12check ~~under~~mark if the registrant ~~Exchange~~has ~~Act~~elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(17a) ~~CFR~~of ~~240~~the Exchange Act.~~14a-12)~~

☐Item ~~Pre-commencement~~5.04. ~~communications~~Temporary ~~pursuant~~Suspension toof ~~Rule~~Trading ~~14d-2(b)~~Under ~~under~~Registrant’s ~~the~~Employee ~~Exchange~~Benefit ~~Act (17 CFR 240~~Plans.~~14d-2(b))~~

☐On ~~Pre-commencement~~January ~~communications~~16, ~~pursuant~~2018, Deltic Timber Corporation (“Deltic”) was notified by the record keeper for the Thrift Plan of Deltic (the “Thrift Plan”) that the record keeper anticipates the need to ~~Rule~~institute ~~13e-4~~a blackout period (cthe “Blackout Period”) ~~under~~in excess of three business days with respect to the ~~Exchange~~ability ~~Act~~of Thrift Plan participants to move their Thrift Plan accounts into or out of the Deltic common stock investment option (17the ~~CFR~~“Deltic ~~240~~Stock Fund”) under the Thrift Plan.~~13e-4~~ The Blackout Period will be implemented in connection with the changes to the Thrift Plan described below in relation to the anticipated closing of Deltic’s previously announced merger with Potlatch Corporation (c“Potlatch”)).

~~Indicate~~Pursuant byto ~~check~~the ~~mark~~Agreement ~~whether~~and Plan of Merger (the ~~registrant~~“Merger isAgreement”) anby ~~emerging~~and ~~growth~~among ~~company~~Deltic, asPotlatch ~~defined~~and inPortland asMerger ~~defined~~LLC in(“Merger ~~Rule~~Sub”), ~~405~~subject to ofshareholder ~~the~~approval ~~Securities~~and ~~Act~~certain ofother ~~1933~~conditions, Deltic is expected to be merged with and into Merger Sub (~~§230~~the “Merger”).~~405~~ ofThe ~~this~~Blackout ~~chapter)~~Period oris ~~Rule~~expected ~~12b-2~~to begin at 11:00 a.m. Central Time on February 16, 2018 and is scheduled to end seven business days following the closing of the ~~Securities~~Merger, ~~Exchange~~subject ~~Act~~to ofa ~~1934~~possible ~~(§240~~early termination described below.~~12b-2~~ Since Deltic does not yet know the exact closing date of ~~this~~the ~~chapter)~~Merger, it is unable to determine the exact dates for the Blackout Period.

~~Emerging~~During ~~growth~~the ~~company~~Blackout ☐Period, subject to completion of the Merger, the Deltic Stock Fund will be modified to become a fund that holds the Potlatch common stock that the Thrift Plan will receive in respect of its Deltic common stock in the Merger and the fund will thereafter be continued as an investment option under the Thrift Plan enabling participants to continue to invest their Thrift Plan accounts in Potlatch common stock. Accordingly, the Blackout Period will apply both during the period prior to the Merger that the Thrift Plan holds Deltic common stock and for a period following the Merger during which the Thrift Plan is awaiting receipt of, and being adapted to facilitate investment in, Potlatch common stock. If the record keeper of the Thrift Plan is able to complete the foregoing Thrift Plan adaptation before the currently anticipated end date, the Blackout Period might be terminated prior to such date.

IfOn anJanuary ~~emerging~~18, ~~growth company~~2018, ~~indicate~~ byDeltic ~~check~~mailed ~~mark~~a ifnotice to participants in the ~~registrant~~Thrift ~~has~~Plan ~~elected~~informing ~~not~~them of the Blackout Period pursuant to ~~use~~the requirements applicable under the ~~extended~~Employee Retirement ~~transition~~Income ~~period~~Security ~~for~~Act ~~complying~~of ~~with~~1974, ~~any~~as ~~new~~amended. orOn ~~revised financial~~January ~~accounting~~19, ~~standards~~2018, ~~provided~~Deltic ~~pursuant~~sent toa ~~Section~~separate 13notice (athe “Notice”) to its directors and executive officers informing them of the Blackout Period and certain trading prohibitions that they will be subject to during the Blackout Period, in accordance with the applicable requirements of Securities Exchange Act of 1934, as amended. The ☐Notice also informed Deltic’s directors and executive officers that the Blackout Period restrictions are separate from, and in addition to, any other restrictions on trading Deltic equity securities currently applicable to them.

~~Item~~A ~~5.02.~~copy ~~Departure~~ of ~~Directors~~the orNotice ~~Certain~~is ~~Officers;~~attached ~~Election~~hereto as ofExhibit ~~Directors;~~99.1 ~~Appointment~~and ofis ~~Certain~~incorporated ~~Officers;~~herein ~~Compensatory~~by ~~Arrangements of Certain Officers~~reference.

OnADDITIONAL December 19, 2017, in order to mitigate or eliminate certain negative tax consequences under Section 280G of the Internal Revenue Code, the Executive Compensation Committee (the “Committee”) of the Board of Directors of Deltic Timber Corporation (the “Company”) authorized the accelerated payment of certain non-equity incentive cash awards, the accelerated vesting of certain amounts of previously granted time-based restricted shares and performance-based restricted shares, as well as the accelerated vesting and deemed exercise of certain amounts of previously granted stock options for its named executive officers.INFORMATION

~~Accordingly,~~This communication is being made in respect of the ~~Committee~~proposed ~~authorized~~merger ~~the~~transaction ~~payment~~involving ofPotlatch ~~non-equity~~and ~~incentive~~Deltic. ~~compensation~~This communication does not constitute an offer to sell or the ~~Company’s~~solicitation ~~President~~of &an ~~Chief Executive~~offer ~~Officer,~~to ~~John~~buy D.any ~~Enlow,~~securities ~~Sr.,~~or ~~and~~a ~~its~~solicitation ~~interim~~of ~~Chief~~any ~~Financial~~vote ~~Officer~~or approval, ~~Byrom~~nor L.shall ~~Walker,~~there atbe ~~100~~any ~~percent~~sale of ~~their~~ ~~respective~~securities ~~target~~in ~~levels.~~any ~~The~~jurisdiction ~~Committee~~in ~~also~~which ~~authorized~~such ~~the~~offer, ~~accelerated~~solicitation ~~vesting~~or ofsale ~~certain~~would ~~amounts~~be ofunlawful ~~previously~~prior ~~granted time-based~~to ~~restricted~~registration ~~shares~~or ~~and~~qualification under ~~performance-based~~the ~~restricted~~securities ~~shares~~laws ~~for~~of ~~Messrs~~such jurisdiction. ~~Enlow~~In connection with the proposed merger, Potlatch and ~~Walker~~Deltic ashave ~~well~~filed asrelevant materials ~~for~~with the ~~Company’s~~ ~~Vice~~Securities ~~President~~and ofExchange ~~Wood~~Commission ~~Products~~(“SEC”), ~~Kent~~including La Potlatch registration statement on Form S-4 (Reg. No. ~~Streeter~~333-221942), ~~its~~which ~~Vice~~the ~~President~~SEC ofhas ~~Real~~declared ~~Estate~~effective, ~~David~~that V.includes ~~Meghreblian, and~~a ~~its~~joint ~~Vice~~proxy ~~President~~statement of Potlatch and ~~General~~Deltic ~~Counsel~~and also constitutes a prospectus of Potlatch, ~~Jim~~which F.was ~~Andrews~~first mailed to Potlatch and Deltic stockholders on January 19, Jr2018. ~~The~~BEFORE ~~performance-based~~MAKING ~~restricted~~ANY VOTING ~~shares~~OR ~~were~~INVESTMENT ~~vested~~DECISION, atSECURITY ~~the~~HOLDERS OF POTLATCH AND DELTIC ARE URGED TO READ THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS ~~maximum~~REGARDING ~~performance~~THE ~~level~~PROPOSED ~~based~~TRANSACTION ~~generally~~AND onANY ~~estimated~~OTHER ~~performance~~RELEVANT ~~and~~DOCUMENTS ~~the~~CAREFULLY ~~terms~~IN ofTHEIR ~~the~~ENTIRETY ~~Agreement~~WHEN ~~and~~THEY ~~Plan~~BECOME ofAVAILABLE ~~Merger~~BECAUSE THEY ~~dated~~WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. The joint proxy statement/prospectus, as ofwell ~~October~~as ~~22,~~other ~~2017~~filings ~~among~~containing information about Potlatch ~~Corporation,~~and ~~Portland~~Deltic ~~Merger~~are ~~LLC~~available without charge, ~~and~~at the ~~Company~~SEC’s Internet site (http://www.sec.gov). ~~The~~Copies ~~Committee~~of ~~further~~the joint proxy statement/prospectus and the filings ~~authorized~~with the ~~accelerated~~SEC ~~vesting,~~that ~~deemed~~are ~~exercise~~incorporated ~~and~~by ~~cash-out~~reference ofin ~~certain~~the ~~amounts~~joint ofproxy ~~previously~~statement/prospectus ~~granted~~can ~~stock~~also ~~options~~be ~~for~~obtained, without charge, ~~Messrs~~from Potlatch’s website at http://www.Potlatchcorp.com ~~Walker,~~under ~~Streeter,~~the ~~Meghreblian,~~Investor Resources tab (in the case of documents filed by Potlatch) and ~~Andrews~~on Deltic’s website at https://www.Deltic.com under the Investor Relations tab (in the case of documents filed by Deltic).

~~Details~~Potlatch and Deltic, and certain of their respective directors, ~~regarding~~executive officers and other members of management and employees may be deemed to be participants in the ~~number,~~solicitation ~~amount~~of proxies from the stockholders of Deltic and ~~estimated~~Potlatch ~~compensation~~in ~~values~~respect of the ~~accelerated~~proposed ~~non-equity~~merger transaction. Certain information about the directors and ~~equity~~executive ~~incentive~~officers ~~awards~~of ~~(based~~Potlatch is set forth in its Annual Report on Form 10-K for the year ended December 31, 2016, which was filed with the SEC on February 17, 2017, its most recent Quarterly Report on Form 10-Q for the ~~Company’s~~quarter ended ~~closing~~September 30, ~~stock~~2017, ~~price~~which was filed with the SEC on October 24, 2017, its proxy statement for its 2017 annual meeting of ~~$90~~stockholders, which was filed with the SEC on April 3, 2017 and its Current Reports on Form 8-K, which were filed on May 1, 2017, May 4, 2017, October 23, 2017 and December 7, 2017.94 Certain Information about the directors and executive officers of Deltic is set forth in its Annual Report on Form 10-K for the year ended December 31, 182016, which was filed with the SEC on March 7, 2017), ~~are~~its ~~listed~~most recent Quarterly Report on Form 10-Q for ~~Exhibit~~the ~~99.1~~quarter ended September 30, 2017, which iswas ~~incorporated~~filed with the SEC on November 2, 2017, its proxy statement for its 2017 annual meeting of stockholders, which was filed with the SEC on March 20, 2017, its supplement to the proxy statement for its 2017 annual meeting of the stockholders, which was filed with the SEC on March 30, 2017 and its Current Reports on Form 8-K, which were filed with the SEC on February 27, 2017, March 8, 2017, May 2, 2017, September 1, 2017, September 5, 2017, October 23, 2017, November 11, 2017 and December 21, 2017. Other information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by ~~reference~~security holdings or otherwise, are included in the joint proxy statement/prospectus.

~~(d)~~Item ~~Exhibits~~9.01. Financial Statements and Exhibits.

~~99.1~~(d) ~~Listing of Accelerated Compensation Amounts Payable to the Company’s Named Executive Officers~~Exhibits.

SIGNATURE

Exhibit Number	Description
99.1	Notice to Directors and Executive Officers dated January 19, 2018.

~~Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.~~SIGNATURES

~~Deltic~~Pursuant ~~Timber~~to ~~Corporation~~the ~~By:~~requirements ~~/s/~~of ~~Jim~~the F.Securities Exchange ~~Andrews~~Act of 1934, ~~Jr.~~the ~~Jim~~Registrant F.has ~~Andrews,~~duly ~~Jr.,~~caused ~~Secretary~~this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: December 21, 2017

		Deltic Timber Corporation

Date:	January 22, 2018	By:	/s/ Jim F. Andrews, Jr.
			Name:	Jim F. Andrews, Jr.
			Title:	Secretary

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