41. No need to master the intricacies of stratigraphy or the history of plate tectonics. 42. Fossils of invertebrates are commonly used in stratigraphy . 43. His thesis treated of the mammals of the French lower Eocene and their stratigraphy . 44. Most of the Cambrian stratigraphy is based on the use of trilobite marker fossils. 45. One of the major achievements of 19th century archaeology was the development of stratigraphy . 46. Despite its complexity, these major tectonic stages were carefully preserved within its stratigraphy . 47. In modern stratigraphy , however, the name only applies to the stratigraphic unit. 48. These events likely caused disturbance of the stratigraphy . 49. Crevasse stratigraphy makes use of annual layers revealed on the wall of a crevasse. 50. There are numerous process that can reverse the stratigraphy or more accurately redeposit it.
