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Early geologists, in the 1700s and 1800s, noticed how fossils seemed to occur in sequences: certain assemblages of fossils were always found below other assemblages. Since 1859, paleontologists, or fossil experts, have searched the world for fossils.In the past 150 years they have not found any fossils that Darwin would not have expected.
Darwin and his contemporaries could never have imagined the improvements in resolution of stratigraphy that have come since 1859, nor guessed what fossils were to be found in the southern continents, nor predicted the huge increase in the number of amateur and professional paleontologists worldwide.Ses bâtiments et la disposition de ses rues reflètent les traditions autochtones aussi bien que les influences étrangères, qui ont donné naissance à ce vestige unique.Description is available under license CC-BY-SA IGO 3.0 تجسد مدينة هوي- آن مثالاً سليماً لمدينة شكلت مرفأ تجارياً جنوب شرق آسيا من القرن الخامس عشر ولغاية القرن التاسع عشر.Biologists actually have at their disposal several independent ways of looking at the history of life - not only from the order of fossils in the rocks, but also through phylogenetic trees. Relative dating is done by observing fossils, as described above, and recording which fossil is younger, which is older.The discovery of means for absolute dating in the early 1900s was a huge advance.