DOI Page / Citation link:
https://doi.org/10.11588/diglit.748#0249
206 ARCHAEOLOGICAL INSTITUTE.
far as Ivadjik. At Pasha-kioy, however, which is directly north of
Behram six kilometres, the rock, although similar in its general
appearance to the trachytes already noticed, is essentially different.
Its few porphyritic feldspars are for the most part plainly striated,
and the crystals of hornblende, much more abundant than the min-
ute scales of mica, sometimes attain a length of five millimetres,
and are more prominent upon a fresh fracture than the feldspar.
This grayish rock appears less siliceous than the ordinary trachytes,
and is not abundant in the Troad, although it occurs at intervals as
far north as Chigri-dagh.
The trachyte designated in the first part of this Report as the
second trachyte, has a wide distribution, and appears to cover con-
siderable districts. It extends only a short distance east and west
of Behram, and is then replaced by other rocks of the same kind.
Commonly its color is light gray, with many irregular milk-white
spots, indicating the presence of numerous crystals of feldspar.
These vary greatly in size, appearing in tabular form sometimes ten
millimetres long and eight millimetres in width. The large crys-
tals are comparatively few, but they are surrounded by innumerable
smaller ones, whose limits upon the rough fractured surface of the
rock are not distinctly outlined. Within the groundmass, which is
irregularly cellular, are numerous small crystals of black mica, and
probably a few of hornblende, with small quantities of other acces-
sory minerals. The crystals are so much fractured that the kind of
feldspar is not easily determined. All of the larger ones may be
orthoclase ; the smaller ones, bearing even indistinct striae, are rare.
The granular and porous structure of the groundmass gives to the
rock a rough, angular fracture.
This trachyte does not form any important topographical feature
south of the Touzla, excepting the Acropolis of Assos, at which
place it appears, from facts already presented in the preceding
paper, to have been extruded from a volcano before the depo-
sition of the tertiary strata of the southern coast was completed.
There is evidence also, but as yet not conclusive, that, at another
place three kilometres west of Behram, this trachyte came up in the
form of a dike and overflowed the ashy strata at the top of the
tertiary.
Among the high mountains north of the Touzla this trachyte
far as Ivadjik. At Pasha-kioy, however, which is directly north of
Behram six kilometres, the rock, although similar in its general
appearance to the trachytes already noticed, is essentially different.
Its few porphyritic feldspars are for the most part plainly striated,
and the crystals of hornblende, much more abundant than the min-
ute scales of mica, sometimes attain a length of five millimetres,
and are more prominent upon a fresh fracture than the feldspar.
This grayish rock appears less siliceous than the ordinary trachytes,
and is not abundant in the Troad, although it occurs at intervals as
far north as Chigri-dagh.
The trachyte designated in the first part of this Report as the
second trachyte, has a wide distribution, and appears to cover con-
siderable districts. It extends only a short distance east and west
of Behram, and is then replaced by other rocks of the same kind.
Commonly its color is light gray, with many irregular milk-white
spots, indicating the presence of numerous crystals of feldspar.
These vary greatly in size, appearing in tabular form sometimes ten
millimetres long and eight millimetres in width. The large crys-
tals are comparatively few, but they are surrounded by innumerable
smaller ones, whose limits upon the rough fractured surface of the
rock are not distinctly outlined. Within the groundmass, which is
irregularly cellular, are numerous small crystals of black mica, and
probably a few of hornblende, with small quantities of other acces-
sory minerals. The crystals are so much fractured that the kind of
feldspar is not easily determined. All of the larger ones may be
orthoclase ; the smaller ones, bearing even indistinct striae, are rare.
The granular and porous structure of the groundmass gives to the
rock a rough, angular fracture.
This trachyte does not form any important topographical feature
south of the Touzla, excepting the Acropolis of Assos, at which
place it appears, from facts already presented in the preceding
paper, to have been extruded from a volcano before the depo-
sition of the tertiary strata of the southern coast was completed.
There is evidence also, but as yet not conclusive, that, at another
place three kilometres west of Behram, this trachyte came up in the
form of a dike and overflowed the ashy strata at the top of the
tertiary.
Among the high mountains north of the Touzla this trachyte