SURVEY GEOLOGICAL SITUATION COLLECTION SSS
Period Epoch  Number of records Estimated age
      Million Years
       
Quaternary Holocene 1191* 0,01
  Pleistocene 2599 1,8
Tertiary Pliocene 7248 5,3
  Miocene 8515 22,5
  Oligocene 1354 33,9
  Eocene 11582 55,8
  Paleocene 858 65
Cretaceous Upper Cretaceous 229 99,6
  Lower Cretaceous 47 145,5
Jurassic Malm  36 161,2
  Dogger 41 175,6
  Lias 34 199,6
Triassic Upper Triassic 0 228
  Middle Triassic 2 245
  Lower Trisssic 0 251
Permian   0 299
Carboniferous Upper Carboniferous 9  
  Lower Carboniferous 4 359,2
Devonian   127 416
Silurian   8 443,7
Ordovician   11 488,3
Cambrium   1 542
* In 2009 we donated 20.399 records containing 96.290 shells to the University of Amsterdam
Growth of the collections