The middle zone is characterized by light and dark bands and the innermost zone of the columnar layer has horizontal growth lines.
42.
It is smooth and cylindrical, bulged and flat in the middle, with growth lines starting at the middle, extending laterally toward two entrances.
43.
In " Paraelongatoolithus ", both layers have very distinct growth lines, and the columnar layer is twice as thick as the cone layer.
44.
The calfbone was sawed to determine the number of " lines of arrested growth " that are usually interpreted as annual growth lines.
45.
Evidence of near starvation as children are evident in the interrupted growth lines in their bones and " enamel hypoplasias " in their teeth.
46.
The notoriously large shell of " Melo melo " has a bulbous or nearly oval outline, with a smooth outer surface presenting distinguishable growth lines.
47.
However, it has been shown that most dinosaur bones have growth lines that are visible in thin sectioned material viewed under a polarized light source.
48.
The shell of " Clavus " is characterised by the following features : Flat indefinite fasciole, indicated only by the curve of growth lines.
49.
There are a few irregular growth lines on the shell and occasional prosocline and nearly straight markings which show former positions of the outer lip.
50.
It is an external mould and the impression left by the valve is so clear that the fine ridges and even the growth lines are visible.
