Sedimentary rocks (2)

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Sedimentary Rocks A Virtual Practical I.G.Kenyon The following slides are all sedimentary rocks From the information displayed Decide if the rock is: clastic, organic or chemical Identify each rock accurately as possible Suggest a sedimentary environment in which it may have formed as Identify this Sedimentary Rock 1cm Poorly Sorted 40% Muddy Matrix Rock Fragments Mineral Grains Identify this Sedimentary Rock Reacts with dilute hydrochloric acid Comprises over 70% broken bivalve shells Remainder of rock is silt and iron oxides 2cm Identify this Sedimentary Rock 2cm Comprises entirely clay minerals and carbonaceous material Well preserved graptolites are found in the rock Splits into thin layers easily (Fissile) Identify this Sedimentary Rock 1cm Reacts with dilute hydrochloric acid Comprises entirely of spherical grains 0.5–1.0mm in diameter Identify this Sedimentary Rock Made up entirely of clay minerals such as kaolinite, illite and bentonite Homogenous or massive with no trace of bedding or laminations 1cm Identify this Sedimentary Rock 4cm Comprises angular fragments 0.5mm – 8cm in diameter All parts of the rock react with dilute hydrochloric acid Identify this Sedimentary Rock 5mm Comprises mainly sub angular quartz and feldspar grains 20% of the rock has fragments - 4mm in diameter Identify this Sedimentary Rock Fibrous appearance Very low density Clearly visible remains of organic matter Rich in carbon 1cm Identify this Sedimentary Rock 29 Majority of clasts are rounded to well rounded Poorly sorted, grain size varies [...]... this Sedimentary Rock 15 2cm Fossil replaced by flint Reacts with dilute hydrochloric acid Rock is made up of coccoliths Identify this Sedimentary Rock 16 1cm Reacts with dilute hydrochloric acid Made up mainly of broken crinoid stems Identify this Sedimentary Rock 17 1cm Comprises entirely well rounded quartz grains 0.25–0.75mm in diameter Very well cemented together by silica Identify this Sedimentary. .. Identify this Sedimentary Rock 22 1cm Reacts with dilute hydrochloic acid Made up entirely of angular shell fragments 0.5-3mm Identify this Sedimentary Rock 23 Has a woody ‘ring’ to it when tapped Rich in carbon Low density 1cm 1cm Organic structure clearly visible Identify this Sedimentary Rock 24 2cm Made up entirely of hydrated calcium sulphate This variety is called Desert Rose Identify this Sedimentary. ..Identify this Sedimentary Rock 9 2cm Composed entirely of silica Broken surfaces show conchoidal fracture Identify this Sedimentary Rock 10 1cm Comprises some clay minerals such as kaolinite and illite Has a gritty feel when rubbed on the teeth, >10% quartz present Identify this Sedimentary Rock 11 Well rounded flint pebbles 8mm – 6cm in diameter... 0.5mm – 5cm in diameter Identify this Sedimentary Rock 19 Comprises angular to sub angular grains of quartz and feldspar Contains more than 25% feldspar Iron oxide cement 1cm Identify this Sedimentary Rock 20 Particle size varies from 1mm – 4cm Comprises fragments of limestone, basalt, slate and quartz All particles are angular Red iron oxide cement 1cm Identify this Sedimentary Rock 21 1cm Comprises quartz... react with dilute hydrochloric acid Identify this Sedimentary Rock 12 1cm Rich in carbon, makes a black mark on paper No recognisable traces of organic material evident Identify this Sedimentary Rock 13 1cm Grain size
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