Site_code,Period,Period_Definition,Period_Comments
,1,EBA,Two features only
,2,M-LBA,can be exclsuively MBA  or LBA but mostly mixed
,3,Saxon,Very limited
,4,,
,5,,
,6,,
,7,,
,8,,
,9,,
,10,,
,11,,
,12,,
,13,,
,14,,
,15,,
,16,,
,17,,
,18,,
,19,,
,20,,