Triassic is ontop

Pre Cambrian below and carboniferous

Are they in stratigraohic contact with and uncofrnity or is there an inconformity that separates the 2?

Pink area = pre Cambrian and inliers

Seismic reflection data

Reflection of sound from layers of upper crust

Cange frm silt stone to sanstone you gte a reflection and an image

Image across the unconformity showing features

Pre camrbian below – nslightly metamorphosed not a lot of acosic contrast

Triassic above – are highy contrasting and softer ayer of sandstone and get

flat lying so no deformation.

What is the geometric relation to the Cambrian? –

Precambrian volcanlcaitc at the surface so available fo reroson and sea

Then deposit the Triassic sedimentary rocks perhaps via storm.

The name for this relationship = inlier (Older rock surrounded by younger) &

Onlap younger strata are olapping hte older eroding surface

Pic is a text book example

Slide – Map

We looked at the top where we summarised at the top.

Slide – google Earth

Look at Charnwood forest and beacon hill

Can see the curvature of the bed clearly and the bds are dipping to the right

The teep side = where the beds are fractures and can pick pit the geomtey of it

E/W – BCL

Next slide – pic 2

Outcrop of cliff.

Trace of the bedding = red lines

Can see the fold axis clearly

This is a syncline

Any possiblty of it being an anticline - everything dipping to te synclinal hinge and better overview frm an aerial image

Slide ; Bradgate park pic

Outcrop of fossil

Next slide ; group 3s area

Series of small folds – monoclines

Antiforms as well.

Low amplitude folds – very gentle (open and rounded)

If we did a crosssecton from N-S

The first fold is like this

Parasitic fold and on the limb of a major fold

Can infer from geometry and fold and shape – can tel major folding style

Slide ; map with area circles.

Need to refer to maps

Slide ; Old paper from mid

Close to major fold

Some BCL data marked

Think about based on our data – is this a good interpretation? Is it viable? Be critical?

Think about if field data supports a single phase of folding or multiple phases of folding.

If cleavage is planar then bCL should be parallel to cleavage

In the example its oblique – so suggests that someting strange eg refracton or multiple pases of deformation and reflects a diff hases of folding to another

Maybe folding happened an then developeda cleavge different

Folds are perpendicular to bedding cleavage

Everything is straightofread and everything is

Multiple deformation

Say – this is the large fold orientation its diff to that so there are 2 phases of deformation

Slide 1978 map

Section

Shows drift = solid and drift geological map

Solid -

Drift is everything intop dumpedby glaciers and rivers = blue outliers

Pink and purple = pre camrbian inliers volcanlciatisc and diarites

Fault = not exposed at surface. When we think about faults they come to surface and stop but sometimes when they come inactive they become with filled with sediment.