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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| History of paleontology | 3/10 | https://en.wikipedia.org/wiki/History_of_paleontology | reference | science, encyclopedia | 2026-05-05T04:00:05.779726+00:00 | kb-cron |
=== Leonardo da Vinci and the development of paleontology === Leonardo da Vinci established a line of continuity between the two main branches of paleontology: body fossil palaeontology and ichnology. In fact, Leonardo dealt with both major classes of fossils: (1) body fossils, e.g. fossilized shells; (2) ichnofossils (also known as trace fossils), i.e. the fossilized products of life-substrate interactions (e.g. burrows and borings). In folios 8 to 10 of the Leicester code, Leonardo examined the subject of body fossils, tackling one of the vexing issues of his contemporaries: why do we find petrified seashells on mountains? Leonardo answered this question by correctly interpreting the biogenic nature of fossil mollusks and their sedimentary matrix. The interpretation of Leonardo da Vinci appears extraordinarily innovative as he surpassed three centuries of scientific debate on the nature of body fossils. Da Vinci took into consideration invertebrate ichnofossils to prove his ideas on the nature of fossil objects. To da Vinci, ichnofossils played a central role in demonstrating: (1) the organic nature of petrified shells and (2) the sedimentary origin of the rock layers bearing fossil objects. Da Vinci described what are bioerosion ichnofossils: The hills around Parma and Piacenza show abundant mollusks and bored corals still attached to the rocks. When I was working on the great horse in Milan, certain peasants brought me a huge bagful of them— Leicester Code, folio 9rSuch fossil borings allowed Leonardo to confute the Inorganic theory, i.e. the idea that so-called petrified shells (mollusk body fossils) are inorganic curiosities. With the words of Leonardo da Vinci:[the Inorganic theory is not true] because there remains the trace of the [animal's] movements on the shell which [it] consumed in the same manner of a woodworm in wood ...— Leicester Code, folio 9vDa Vinci discussed not only fossil borings, but also burrows. Leonardo used fossil burrows as paleoenvironmental tools to demonstrate the marine nature of sedimentary strata:Between one layer and the other there remain traces of the worms that crept between them when they had not yet dried. All the sea mud still contains shells, and the shells are petrified together with the mud— Leicester Code, folio 10vOther Renaissance naturalists studied invertebrate ichnofossils during the Renaissance, but none of them reached such accurate conclusions. Leonardo's considerations of invertebrate ichnofossils are extraordinarily modern not only when compared to those of his contemporaries, but also to interpretations in later times. In fact, during the 1800s invertebrate ichnofossils were explained as fucoids, or seaweed, and their true nature was widely understood only by the early 1900s. For these reasons, Leonardo da Vinci is deservedly considered the founding father of both the major branches of palaeontology, i.e. the study of body fossils and ichnology.
== 17th century ==
During the Age of Reason, fundamental changes in natural philosophy were reflected in the analysis of fossils. In 1665 Athanasius Kircher attributed giant bones to extinct races of giant humans in his Mundus Subterranneus. In the same year Robert Hooke published Micrographia, an illustrated collection of his observations with a microscope. One of these observations was entitled "Of Petrify'd wood, and other Petrify'd bodies", which included a comparison between petrified and ordinary wood. He concluded that petrified wood was ordinary wood that had been soaked with "water impregnated with stony and earthy particles". He then suggested that several kinds of fossil sea shells were formed from ordinary shells by a similar process. He argued against the prevalent view that such objects were "Stones form'd by some extraordinary Plastick virtue latent in the Earth itself". Hooke believed that fossils provided evidence about the history of life on Earth writing in 1668:
...if the finding of Coines, Medals, Urnes, and other Monuments of famous persons, or Towns, or Utensils, be admitted for unquestionable Proofs, that such Persons or things have, in former times had a being, certainly those Petrifactions may be allowed to be of equal Validity and Evidence, that there have formerly been such Vegetables or Animals... and are true universal Characters legible to all rational Men.