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(AP) -- COLUMBUS, Ohio (AP) - Ohio geologists' latest effort to map the best areas for Utica shale oil and gas production shows potential for an oil reservoir in central Ohio but now excludes areas near Cleveland and in southeast Ohio.

The head of the Ohio Geological Survey tells The Columbus Dispatch it's simply the state's best guess at mapping core areas where shale is expected to yield the most natural gas, oil and other resources. He says not all the core areas may be productive, and other areas may still be productive. The newest map indicates potential oil production in Delaware, Marion and Union counties. But it no longer includes most of Cuyahoga, Lake and Lorain counties in northeast Ohio and some or all of Athens, Meigs, Morgan and Washington counties in southeast Ohio.

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