Source please, if
> possible!  Are those lines and tiny pits on the surface a part of
> the procedural texture?  
> 
The pits are pretty standard fare.  You use the cells pattern:
.
.
.
cells
triangle_wave
scale .025
turbulence <1,1,0>
pigment_map {
		[ 0 rgb 1 ]

		[ .2485 rgb 1 ]
		[ .25 rgb 0 ]
		[ .2515 rgb 1 ]

		[ .5485 rgb 1 ]
		[ .55 rgb 0 ]
		[ .5515 rgb 1 ]

		[ 1 rgb 1 ]
}
.
.
.
The head is about 4 pov units high

The lines are actually a crackle pattern, with the pigment_map 
manipulated to get thin 'slices' of black, similar to above.  Ten 
instances, rotated in different, ways were then averaged together.

The wood pigment is also averaged into the final normal pattern

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