Era
Early works to 1800
4,125
20th century
2,249
19th century
1,984
Cretaceous
1,680
1809-1882
1,147
Tertiary
993
1879-1955
982
18th century
976
Quaternary
943
17th century
884
Paleozoic
873
Devonian
846
Precambrian
806
Pleistocene
792
Ordovician
712
1900-1999
684
1564-1642
629
20e siècle
622
Cenozoic
572
1642-1727
568
Eocene
563
Permian
561
Miocene
532
Mesozoic
525
Jurassic
507
Pennsylvanian
502
1800-1899
501
19e siècle
480
Silurian
468
Crétacé
455
Cambrian
451
Triassic
448
Carboniferous
442
From 65 to 140 million years ago
382
Mississippian
376
1473-1543
352
1961-
346
16th century
300
Holocene
287
1769-1859
272
Tertiaire
269
Pliocene
253
Oligocene
248
To 1500
247
Dévonien
245
18e siècle
239
Paléozoïque
238
Proterozoic
235
21st century
234
Quaternaire
228
more ...