In his many published works (all of them more than 170) Pallas published as the traveler, a zoologist, botanist, paleontologist, mineralogist, geologist, surveyor, geographer, physician, ethnology, archaeologist, philologist, even a rural landlord and technology. Despite this variety of specialties, he was not a surface scientist, but this was encyclopedic.

   It is serious and profound were his concepts of zoology, it is possible to conclude from the fact that he was greatly ahead of scientists of the time for the whole century. Suffice it to mention the following examples. Already in 1766 Pallas said that the strict separation of animals and plants can not be identified and zoofitov types of worms, in 1772 he advocated the possibility of origin of several relatives of a species from a common father in 1780 Pallas first indicated that the extraordinary variation of some animals such as dogs, due to the origin of several species. However, despite the development of ideas of the historical development of the organic world, Pallas at the end of life have come to recognize the constancy and invariability of species.

   Geology of the Pallas for the first time, you can find a reference to the sequence of geological layers (1777). During visits to the south-eastern steppes, he said traces of the old top-standing level of the Caspian Sea, and rather precisely defined part of the ancient shores.