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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0000101778-05-000048.txt : 20050308
<SEC-HEADER>0000101778-05-000048.hdr.sgml : 20050308
<ACCEPTANCE-DATETIME>20050308192554
ACCESSION NUMBER:		0000101778-05-000048
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050304
FILED AS OF DATE:		20050308
DATE AS OF CHANGE:		20050308

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CAZALOT CLARENCE P JR
		CENTRAL INDEX KEY:			0001173583

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	033-07065
		FILM NUMBER:		05667907

	MAIL ADDRESS:	
		STREET 1:		5555 SAN FELIPE ROAD
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77056

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARATHON OIL CORP
		CENTRAL INDEX KEY:			0000101778
		STANDARD INDUSTRIAL CLASSIFICATION:	PETROLEUM REFINING [2911]
		IRS NUMBER:				250996816
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 3128
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77253-3128
		BUSINESS PHONE:		7136296600

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	USX CORP
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	UNITED STATES STEEL CORP/DE
		DATE OF NAME CHANGE:	19860714
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>PRIMARY DOCUMENT
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                <transactionShares>
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                <transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
                    <value>356052.000</value>
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            <ownershipNature>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            <transactionDate>
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            </transactionDate>
            <transactionCoding>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500.000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>48.98</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>355552.000</value>
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            </postTransactionAmounts>
            <ownershipNature>
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                <transactionCode>S</transactionCode>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2300.000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>48.99</value>
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                <transactionAcquiredDisposedCode>
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                <transactionPricePerShare>
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    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <ownerSignature>
        <signatureName>R. J. Kolencik-Attorney-in-Fact for Clarence P. Cazalot, Jr.</signatureName>
        <signatureDate>2005-03-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----