Generate an approximately fifteen-word sentence that describes all this data: Dead Man's Plack LOCATION England; England ETHNIC_GROUPS British Arabs; Dead Man's Plack DEDICATED_TO thelwald, Ealdorman of East Anglia; Dead Man's Plack MATERIAL Rock (geology)
The Dead Man's Plack is a rock formation in England dedicated to Aethelwald, Ealdorman of East Anglia. One of the ethnic groups to be found in England is that of the British Arabs.