Looking at archives of PARS on California and see many where ships, expeditions traveled from Port San Blas of Nayarit, Mexico up north to San Diego, Monterrey and San Francisco, California, Mexico in 1770's - 1800's.
This one is the year 1775 where the ship "San Carlos" commanded by Capitan Juan De Ayala traveled from Port of San Blas, Nayarit up to Ports of Monterrey and San Francisco of northern province of California. It is title "Bucarely sobre arribo a San Blas del paquebot ''San Carlos'' in the PARS Archives if you want to search and read a 48 page document.
Here he describes entering the San Francisco Bay:
http://pares.mcu.es/ParesBusquedas/servlets/ImageServlet?accion=41&txt_…
He describes, "Almejas" which is a name on a patch of clear land on a map on the Pacific Coast side just beforing entering San Francisco Bay. I had found two maps of the San Francisco Bay in Mapas/Planos year 1777 in which that maps has dotted lines on land passing through numbered circles which seem to be "Monterrey," going up north to other numbered cirlces all the way up to cirlce number 5 which is the Presidio of San Francisco. Names of rivers are on that map. I will later post that map I found. I also found another map which I thought was year 1772 but description says "probably 1802" and by the "oficiales of San Blas" as described on the map. That map of San Francisco Bay Area is colorful as it shows lots of trees in green and several clear patchs of land with names such as "San Mateo" "Presidio San Francisco" "Mision San Francisco" "Almejas" Almejas is on the Pacific side just before entering San Fancisco Bay which is described by name by Capitan Juan De Ayala. So that latter map may be older or concided with the map of 1777. This is good because it would then prove that those villages and San Francisco existed back in 1770's. I will also post that map later on.
