Scooby-Doo, Where Are You? (1969-72)
Harlem Globetrotters (1970-71)
Josie and the Pussycats (1970-72)
The Jackson 5ive (1971-73)
The Brady Kids (1972-74)
Wait 'Til Your Father Gets Home (1972-74)
Fat Albert and the Cosby Kids (1972-84)
Star Trek: The Animated Series (1973-74)
Speed Buggy (1973-76)
Super Friends (1973-83)
Schoolhouse Rock! (1973-86)
The New Adventures of Gilligan (1974-75)
Hong Kong Phooey (1974-76)
Fraidy Cat (1975-76)
The Great Grape Ape Show (1975-78)
Dynamite, Dog Wonder (1976-77)
Jabberjaw (1976-78)
Tarzan, Lord of the Jungle (1976-79)
Captain Caveman and the Teen Angels (1977-80)
Fangface (1978-80)

IMO when I look back at animation in the '70s, it represented the lowest common denominator, with limited animation techniques peaking and see it as the yin of animation since it developed. Theatrical shorts died out early in the decade, there weren't too many feature animated features, and this was before the daily syndication of cartoons that would take off in the '80s. The '70s seemingly not only lacked the quantity, but also the quality. That said, some shows had some really good writing, however I feel there were way too many Scooby-Doo clones. I would extend Scooby-Doo up to 1986 to count the New Scooby Doo-Movies and The Scooby-Doo Show, and the infamous "Scrappy" era, though the final "classic" Scooby season, the 13 Ghosts of Scooby Doo, was good. Josie and the Pussycats also continued until 1974 when it moved to Outer Space. The '70s also had lots of decent animated specials, and most of the memorable Peanuts specials came out in the '70s.

Here are some others:

Pink Panther (1969-1979)
Hot Wheels (1969-71), its cancellation led to a ban of merchandise-driven cartoons until the '80s
Sky Hawks (1969-71)
Hardy Boys (1969-71)
Motor Mouse (1970-71)
Woody Woodpecker (1970-1972, 1976), contains a mix of classic theatrical shorts with some new footage) Not the first TV cartoon, though as one lasted for one season in 1957-58)
Sabrina and the Groovy Goolies/Teenage Witch (1970-74)
Tom Foolery (1970-71)
Will The Real Jerry Lewis Please Stand Up! (1970-72)
Dr. Doolittle (1970-72)
Archie's Funhouse Featuring the Giant Jukebox (1970-71)
Archie's TV Funnies (1971-1973)
Debuty Dawg (1971-1972)
Funky Phantom (1971-1973)
Help! It's The Hair Bear Bunch (1971-72)
Kid Power (1971-73)
Pebbles and Bamm Bamm (1971-72)
Amazing Chan and the Chan Clan (1972-73)
Around The World in 80 Days (1972-73)
Barkleys (1972-73)
The Flinstones Comedy Hour (1972-73)
Houndcats (1972-73)
The Osmonds (1972-73)
Roman Holidays (1972-73)
Sealab 2020 (1972-73)
ABC (New) Saturday Superstar Movie (1972-74)
Addams Family (1973-74)
Bailey's Comets (1973-74)
Butch Cassidy and the Sundance Kids (1973-74)
Emergency Plus Four (1973-75)
Goober and the Ghost Changers (1973-74)
Inch High Private Eye (1973-74)
Jeannie (1973-75)
Lassie's Rescue Rangers (1973-75)
Mission: Magic (1973-74)
My Favorite Martians (1973-74)
Yogi's Gang (1973-74)
Delvin (1974-75)
Partridge Family 2200 A.D. (1974-75)
These are the Days (1974-75)
U.S. of Archie (1974-75)
Valley of the Dinosaurs (1974-75)
Wheelie and the Chopper Bunch (1974-75)
Oddball Couple (1975-76)
Return to the Planet of the Apes (1975-76)
Secret Lives of Waldo Kitty (1975-76)
Clue Club (1976-77)
Baggy Pants and the Nitwits (1977-78)
C.B. Bears (1977)
I Am The Greatest: The Adventures of Muhammad Ali (1977-78)
The New Archie Sabrina Hour (1977-78)
Skatebirds (1977-78, partly live action)
What's New, Mr. Magoo? (1977-78)
Young Sentinels (1977-78)
The All-New Popeye Show (1978-83)
Fantastic Four (1978-79)
Godzilla Power Hour (1978-89)
Yogi's Space Race (1978)
Fred and Barney Meet The Thing (1979-80)
The New Adventures of Flash Gordon (1979-80)
The New Adventures of Mighty Mouse and Heckle and Jeckle (1979-82)
The New Schmoo (1979-80)
Spiderwoman (1979-80)
The Super Globetrotters (1979)

As it turns out, you'll find that the very beginning of the decade tended to have the best quality, with a gradual decline in both quality and quanity, reaching a minimum around 1976 when live action was pretty much at its peak, and a slow improvement at the end of the decade.

The Mr. Men characters were adapted into two animated television series in 1974 that consisted of a total of 28 episodes.

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