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...open ocean, and some were adapted to low concentrations of oxygen in water hundreds of metres deep. How they reproduced is not clear. Figure 6 shows a range of trilobites from the Ordovician Period. [Figure 6] Figure 6 A selection of Ordovician trilobites from central Wales. (a) Oygiocarella (7.5 cm). (b) Cnemidopyge (3 cm). (c) Telaeomarrolithus (2 cm). Trilobites like...

...little pieces of other rocks, stuck together with some kind of cement. Your igneous and metamorphic rocks will have the grains actually interlocking. And your metamorphic rocks might have some kind of alignment, but you'll often have to step back to see it. Good luck, and happy hunting! Like geology? Find out more with these FREE resources Study geo-sciences with the OU...

...resources and, in extreme cases like with the tiger, kill each other. Globally, the nature conservation movement’s strategy has been to create human-free ‘protected areas’ exclusively for wildlife. This has worked well across much of the world, arguably even in India where tiger numbers have increased considerably since the inception of project tiger in 1973. But it...