RARE ORIGINAL 1857 EARLY ANTIQUE GEOLOGICAL MAP OF CALIFORNIA. TITLE-GEOLOGICAL MAP OF A PART OF THE STATE OF CALIFORNIA EXPLORED IN 1855 BY LIEUT R. DATE 1857, DATED 1855 IN TITLE BUT PUBLISHED IN 1857. RARE ORIGINAL 1857 ANTIQUE MAP OF PART OF CALIFORNIA. SCARCE AND IMPORTANT GEOLOGICAL MAP OF PART OF CALIFORNIA SHOWING THE STATE IN STRATUM REGIONS WITH TOWNSHIPS, MILITARY FORTS, WATERWAYS, MOUNTAIN RANGES AND PORTIONS OF THE SURROUNDING TERRITORIES. TOWNSHIPS SHOWN INCLUDE SAN DIEGO, SAN FRANCISCO, LOS ANGELES, SAN JUAN, SAN FERNANDO AND OAKLAND(WITH THIS MAP BEING AMONG THE FIRST TO SHOW IT). LAKE TAHOE IS SHOWN AS LAKE BONPLAND AND MUCH SMALLER AND MONO LAKE IS SHOWN MUCH LARGER THAN IT’S ACTUAL SIZE. UTAH TERRITORY COVERS PRESENT DAY NEVADA AND NEW MEXICO TERRITORY EXTENDS TO THE CALIFORNIA BORDER. THIS MAP IS THE FIRST GEOLOGICAL SURVEY MAP OF CALIFORNIA. MEASURES 23.5 X 17 INCHES ENTIRE SHEET. GOOD CONDITION, DISCOLORATION SPOTTING, CREASES AS ISSUED, MISFOLDS, TEAR AT LEFT SIDE(LAST PICTURE).