UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549



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FORM 10-K/A



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(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2006

OR

 ̈TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 1-12147

DELTIC TIMBER CORPORATION

(Exact name of registrant as specified in its charter)



|                                                               |  |                                        
|-------------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                       |  | 71-0795870                             
|(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification Number)
|                                                               | 
|210 East Elm Street, P. O. Box 7200, El Dorado, Arkansas       |  | 71731-7200                             
|(Address of principal executive offices)                       |  | (Zip Code)                             

Registrants telephone number, including area code: (870) 881-9400

Securities registered pursuant to Section 12(b) of the Act:



|                                                                  |  |                                          
|----------------------------------------------------------------- |  | -----------------------------------------
|Title of each class                                               |  | Name of each exchange on which registered
|                                                                  | 
|Common Stock, $.01 Par Value                                      |  | New York Stock Exchange, Inc.            
|                                                                  | 
|Series A Participating Cumulative Preferred Stock Purchase Rights |  | New York Stock Exchange, Inc.            

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ̈No x

Indicate by check mark if the registrant is
not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ̈No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934
during the preceding 12 months, and (2) has been subject to such filing requirements for the past 90 days.

Yes x No ̈

Indicate by check mark if disclosure of
delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. x

Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer ̈Accelerated filer
x        Non-accelerated filer ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ̈No x

The aggregate market value of the Common Stock
held by non-affiliates of the registrant, based on the average of the high and low prices of the Common Stock on the New York Stock Exchange on June 30, 2006, was $320,038,195. For purposes of this computation, all officers, directors, and 5%
beneficial owners of the registrant (as indicated in Item 12) are deemed to be affiliates. Such determination should not be deemed an admission that such directors, officers, or 5% beneficial owners are, in fact, affiliates of the registrant.

Number of shares of Common Stock, $.01 Par Value, outstanding at January 31, 2007, was 12,449,872.

Documents incorporated by reference:

The Registrants
definitive Proxy Statement relating to the Annual Meeting of Stockholders on April 26, 2007.