FAUNAL RELATIONSHIPS OF THE MEGANOS GROUP 155 
stones, cross-bedded sandstones, and conglomerates. Above this 
is a great thickness of land-laid beds which are generally correlated 
with the Sespe formation. 
Unconformity.—The contact between the Tejon and Meganos 
of this section is marked by conglomerates and conglomeratic 
sandstones. At a number of localities true. basal conglomerate 
was found. The unconformity between the beds of these two 
horizons is also brought out by the mapping. On the south side 
of the Simi Valley near its east end the Meganos beds have a 
thickness of about one thousand five hundred feet; traced west- 
ward they thin out rapidly and near the west end of the valley 
disappear, due to overlap of the Tejon beds. This disappearance 
of the Meganos beds takes place in a very short distance, there 
being an appreciable difference in strike between the beds of the 
two horizons, which could only have been the result of crustal 
movements. | 
Fauna.—tThe following is a list of species obtained from the 
basal beds of the Tejon of this section, University of California 
locality 3311: 
Cardium brewerit Gabb Ficopsis remondit Gabb 
Corbicula, n. sp. ? Natica hornit Gabb 
Glycimeris sagitata Gabb Pseudoperissolax blakei (Conrad) 
Marcia? n. sp. Turritella uvasana Conrad 
Tellina, sp. Turris (Surculites) sinuata -Gabb 
Amauropsis alveata Conrad Turris (Surcula) io Gabb 
Crepidula pilium (Gabb) Whitneya ficus Gabb 
Though this fauna is a small one, the writer feels confident 
in his correlation of these beds with those of the typical Tejon, 
because: (1) of the presence of an angular unconformity between 
the beds containing these species and those containing a typical 
Meganos fauna; (2) because it is believed that a number of the. 
species listed above are characteristic of the Tejon. All are very 
common in the fauna obtained from the type section of the Tejon, 
and only four of the species have been found in beds of Meganos 
age: Amauropsis alveata Conrad, Ficopsis remondit Gabb, Natica 
hornit Gabb, and Pseudoperissolax blaket (Conrad). 
The fauna obtained from the Meganos of this general section is 
one of the best preserved and largest from any known section 
