Need your sources Mr.50+ Geologist if you really know what you're talking about, also I wrote this based on Darwin's book (The Origin of Species) it self which is the main source of this whole theory.
No it is not the source for the whole theory. It is over 160 years + old, and decidedly outdated. The only calue of Darwin's writtings is historical on the beginnings of the science of evolution. There are literally tens of thousands of more recent peer reviewed research articles and publication, and general education materials on evolution just in recent years.
National Geographic has many articles and films on the contemporary science of evolution.
This one open resource journal on evolution:
BMC Evolutionary Biology
The following is a good website that provide contemporary work on the science of evolution.
https://evolution.berkeley.edu/evolibrary/home.phpUnderstanding Evolution evolution.berkeley.edu
The following is a list of 'some' of the contemporary texts on evolution. Take your pick.
II. Accessible General Books
Bonner, J. T. 1988. The Evolution of Complexity. Princeton: Princeton Univ. Press.
Dawkins, R. 1986. The Blind Watchmaker. New York: Norton.
Gould, S. J. 1989. Wonderful Life. New York: Norton.
III. History and Philosophy
Hall, B. J. (ed.). 1994. Homology, the Hierarchical Basis of Comparative Biology. San Diego: Academic Press (a collection of essays by many authors).
Keller, E. F. and E. A. Lloyd. 1992. Keywords in Evolutionary Biology. Cambridge, MA: Harvard Univ. Press.
Mayr, E. 1982. The Growth of Biological Thought: Diversity, Evolution and Inheritance. Cambridge, MA: Harvard Univ. Press.
Rieppel, O. 1988. Fundamentals of Comparative Biology. Basel: Birkhäuser
IV. Units of Evolution
Dawkins, R. 1982. The Extended Phenotype. New York: W. H. Freeman.
Williams, G. C. 1966. Adaptation and Natural Selection. Princeton: Princeton Univ. Press (destined to be classic).
Williams, G. C. 1992. Natural Selection: Domains, Levels and Challenges. New York: Oxford Univ. Press.
V. Population and Quantitative Genetics
Crow, J. F. 1991. Basic Concepts in Population, Quantitative, and Evolutionary Genetics. New York: W. H. Freeman.
Falconer, D. S. 1981. Introduction to Quantitative Genetics, second ed. London: Longman.
Hartl, D. L. And A. G. Clark. 1989. Principles of Population Genetics, second, ed. Sunderland, MA: Sinauer.
Real, L. A. (ed.). 1994. Ecological Genetics. Princeton: Princeton Univ. Press (a collection of essays by many authors).
VI. Selection
Bell, G. 1996. The Basics of Selection. New York: Chapman and Hall.
Sober, E. 1984. The Nature of Selection, Evolutionary Theory in Philosophical Focus. Cambridge, MA: MIT Press.
VII. Molecular Evolution
Gillespie, J. H. 1992. The Causes of Molecular Evolution. New York: Oxford Univ. Press.
Kimura, M. 1983. The Neutral Theory of Molecular Evolution. Cambridge: Cambridge Univ. Press.
Li, W-H. and D. Grauer. 1991. Fundamentals of Molecular Evolution. Sunderland, MA: Sinauer.
Ohno, S. 1970. Evolution by Gene Duplication. New York: Springer Verlag (a minor classic, now out of date).
VIII. Adaptation and Life Histories
Roff, D. A. 1992. The Evolution of Life Histories. New York: Chapman and Hall.
Rose, M. R. and G. V. Lauder (eds.). 1996. Adaptation. San Diego: Academic press (a collection of essays by many authors).
IX. Species Concepts and Species Formation
Otte, D. and J. A. Endler (eds.). 1989. Speciation and its Consequences. Sunderland, MA: Sinauer (a collection of essays by many authors).
X. Phylogenetics and Systematics
Hillis, D., C. Moritz, and B. Mable. 1996. Molecular Systematics, second edition. Sunderland, MA: Sinauer.
Maddison, W. P. and D. R. Maddison. 1992. Macclade, Analysis of Phylogeny and Character Evolution, version 3. Sunderland, MA: Sinauer (Part 2, chapters 3 6, deal with modern phylogenetic theory).
Sanderson, M. J., and L. Hufford. 1996. Homoplasy, the Recurrence of Similarity in Evolution. San Diego: Academic Press (a collection of essays by many authors).
XI. Adaptive Radiation and Major Features of Evolution.
Grant, P. R. 1986. Ecology and Evolution of Darwin's Finches. Princeton: Princeton Univ. Press.
Nitecki, M. H. (ed.). 1990. Evolutionary Innovations (a collection of essays). Chicago: Chicago Univ. Press.
XII. Development and Evolution
Gould, S. J. 1977. Ontogeny and Phylogeny. Cambridge, MA: Belknap Press
Hall, B. J. 1992. Evolutionary Developmental Biology. New York: Chapman and Hall.
McKinney, M. L. and K. McNamara. 1991. Heterochrony: the Evolution of Ontogeny. New York: Plenum.
Raff, R. A. 1996. The Shape of Life: Genes, Development and the Evolution of Animal Form. Chicago: Chicago Univ. Press.