BIOL 2903 Lecture Notes - Lecture 7: Igneous Rock, Canadian Shield
5 Mar 2017
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Document Summary
The sutton hill at the heart of the hbl. It is older rock that is not full of calcium. It is really old rock surround by younger rock. It is the only real relief in the hbl. Diabase sills: old igneous rock that lacks calcium. Disjunct: the populations are greatly separated by space (separated from other populations: greenland sandwort: a very northern plant. It requires the cold, rocky habitat: rock polypody common farther south. Lies entirely on the canadian shield which means that it is a rugged area. Old rocks (1-3 billion years old) mostly acidic (silica and quartz) and hard. White pine and red pine not found in this region for the most part. Dominant trees are coniferous trees such as: black spruce spindly look. Needles are single and hairs on the twig. Needles are very round and can be rolled. Twig is dark and orange tinted: white spruce needles long and fragrant.
