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LIST OF SPECIES 7 Since the period of deposition, the rocks of the
Santa Ynez range have undergone some folding, leaving the strata of
diatoms nowhere horizontal. The Xyne layer stands where examined by
us at an angle of about thirty degrees, the north side highest.
From the natural history view, this stratum is the most remarkable
feature of the deposit. At about 950 feet from the bottom, at a
certain horizon everywhere the same, is a layer of an extinct
herring, described by us in a previous paper as Xyne Grex.
Individuals lie on the bottom wherever this layer has been exposed.
They are all of about the same size, about six inches long, all
adult and nowhere mixed with any other fish. Apparently the species
swarmed in the bay for spawning purposes, and the entire mass was
heated, suffocated, or otherwise killed in an instant and with no
evidence of agony or distortion. In the rocks above, occasional
examples are found, always as imprints, while those of the main
mass have been mostly carbonized and left black or nearly so. The
other fishes found in these deposits mainly occur in the upper
strata. Only large fishes, a foot or more?herrings ex- cepted?are
found here, these being mainly mackerel, flounders, bass, rock-fish
and the like, which were apparently in pursuit of the herring. All
of these are described and figured in the pages which follow. This
Lompoc fauna contrasts strongly with that described from the impure
diatomaceous shales at El Modena and Bairdstown?of the same age,
but evidently under different conditions. All the fishes of these
deposits are immature, evidently residents of shallow bays within
the archipelago which now forms the counties of Los Angeles and
Orange. The species thus far found at Lompoc are the following (new
names in italics): Fam...
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