Grateful acknowledgement is made to the following sources:

• A Geological Map of Scotland by Dr MacCulloch EMS.b.2.149
  http://maps.nls.uk/joins/1346.html 
  © National Library of Scotland
• Geological map of Britain William Smith 1815
  http://en.wikipedia.org/wiki/File:Geological_map_Britain_William_Smith_1815.jpg 
  Source: LiveScience Image Gallery 
• Image of the Alamat meteorite in situ on desert floor
  https://www.meteorite-recon.com/wp-content/uploads/2015/09/Alamat_meteorite_lfl-1024x592.jpg
  Source: Dr Svend Buhl, Meteorite Recon
• Image of Andy Tindle (at the top of this page!)
  With the kind permission of Dr Richard Greenwood

Every effort has been made to contact copyright holders. If any have been inadvertently overlooked the publishers will be pleased to make the necessary arrangements at the first opportunity.