MLM Martin Marietta Materials Inc

Martin Marietta Materials, Inc. (NYSE:MLM) today announced that it will provide an online Web simulcast of its first quarter 2008 earnings conference call on Tuesday, May 6, 2008. The Company will release results for the first quarter ended March�31, 2008, that morning before the market opens. The live broadcast of Martin Marietta Materials' conference call will begin at 2:00 p.m. Eastern Time on May 6, 2008. An online replay will be available approximately two hours following the conclusion of the live broadcast and will continue for one year. A link to these events is available at the Company's website: www.martinmarietta.com. For those investors without online web access, the conference call may also be accessed by calling 719-325-4884, confirmation number 4451342. Martin Marietta Materials is a leading producer of construction aggregates and a producer of magnesia-based chemicals and dolomitic lime. MLM-G