Mouth ulcers: Symptoms, treatment and prevention. Mouth ulcers are sores that appear in the mouth, often on the inside of the cheeks. Mouth ulcers, also known as apthous ulcers, can be painful when eating, drinking or brushing teeth.
Fossils are generally found in sedimentary rock. This occurs because the remains of plants and animals tend to accumulate with the inorganic debris that form such rock. In rare instances, fossils can form in igneous rock, as when volcanic ash or lava congeals around a leaf or insect wing, or fills a footprint.xposed rock is the collector's fruitful ground. Many interesting minerals and fossils can be found on weathered slopes, riverbanks, and cliff faces. Human-made excavations such as road cuts and construction or quarry sites can be excellent sites for mineral hunting.
How to find fossils. see also: What to do once you find a fossil. Fossils are found in sedimentary rocks most of the time. Sometimes fossils can be found under volcanic ash or even preserved under a lava flow, but this is very rare. NOTE: Sedimentary rocks do not always have fossils in them.Layers are a characteristic of sedimentary rocks. The bottom layers are naturally the oldest. Some types of rocks found in the layers: Limestone, mainly calcium carbonate, common in warm, shallow seas, often has fossils.Shale is a fine grained rock formed from silt and clays.OTE: Sedimentary rocks do not always have fossils in them. Layers are a characteristic of sedimentary rocks. The bottom layers are naturally the oldest. Some types of rocks found in the layers: Limestone, mainly calcium carbonate, common in warm, shallow seas, often has fossils.