The node created and updated timestamps are stored in the base "node" table.
e.g
$result = db_selectdb_query('node',"SELECT 'n')
->fields('n'nid, array('nid'title, 'title'changed, 'created',created 'changed')FROM {node} ORDER BY nid ASC LIMIT 10");
->orderBy('nid')
->rangewhile(0,10)
->execute$row = db_fetch_object($result);
){
foreach($result as // drupal_set_message($row->title){;
drupal_set_message('<pre>'.print_r($row,1).'</pre>');
}