Cambrian
61Cambrian — The geologic period between 540 and 510 million years ago. This is the beginning of the classic fossil period. See Cretaceous …
The writer's dictionary of science fiction, fantasy, horror and mythology
62Cambrian — adj. & n. adj. 1 Welsh. 2 Geol. of or relating to the first period in the Palaeozoic era, marked by the occurrence of many forms of invertebrate life (including trilobites and brachiopods). Usage: Cf. Appendix II. n. this period or system.… …
63Cambrian Mountains — geographical name range central Wales …
65Cambrian Mountains — a range of low mountains running north to south in central Wales. * * * …
66Cambrian Mountains — /kæmbriən ˈmaʊntənz/ (say kambreeuhn mowntuhnz) plural noun a low mountain range in Wales extending from Carmarthenshire to Denbighshire. Highest point, Aran Fawddwy, 896 m …
67Cambrian Mountains — noun a rugged plateau that runs north to south through central Wales • Instance Hypernyms: ↑tableland, ↑plateau * * * a range of low mountains running north to south in central Wales …
68Early Cambrian — The Early Cambrian (also known as the Caerfai, Waucoban, or Georgian) is the first of three geological epochs of the Cambrian period. It spans the time between 542 ± 0.3 Ma and 513 ± 2 Ma (million years ago). The Cambrian explosion of complex… …
69Debate about Cambrian Lophotrochozoans — Since 1990 there has been intense debate among paleontologists about the evolution in the Early Cambrian period of the super phylum Lophotrochozoa, which is thought to include the modern molluscs, annelid worms and brachiopods, as well as their… …
70Discredited hypotheses for the Cambrian explosion — As our understanding of the events of the Cambrian becomes clearer, data has accumulated to make some postulated causes for the Cambrian explosion look improbable. Some examples are the evolution of herbivory, vast changes in plate tectonic rates …
