1- Roermond, Limburg, 1993.

Copyright PTAH


2- Roermond, Limburg, 07-07-1993.

Copyright PTAH

This formation was found on the west-side of the railroad of Weert-Roermond. The diameter of the large circle was approx. 8-10 metres and the smaller were approx. 4-5 metres.


3- Bunne, Drenthe, 13-07-1993.

Copyright PTAH


4- Houthem, Limburg, 26-07-1993.

Copyright PTAH


5- Houthem, Limburg, 1993.

Copyright PTAH


6- Ubachsberg, Limburg, 11-07-1993.

Copyright PTAH


7- Slochteren, Groningen, 1993.

Copyright PTAH